Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a5ed8eaed9f4c4…

MALICIOUS

PDF

45.7 KB Created: 2020-08-19 15:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 76e6b22e5674795ff0220b2a3696dde9 SHA-1: b5c5d601287a3be3af4596a073b7b6435407ca21 SHA-256: 51a5ed8eaed9f4c40a3e2e66b0a3abf1adf5d0d7ec299e4c574e4f8c93803d4a
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a link farm and a prominent link disguised as a game download, which redirects to a known malicious URL. The heuristic firings indicate a malicious redirector and a link farm, suggesting a phishing or malware distribution attempt. The presence of a 'LOLBin run command' firing suggests potential execution of malicious scripts or commands, although no specific script content was extracted. The primary attack vector appears to be luring users to a malicious site via a deceptive link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=candy+crush+game+for+computer+free In PDF document text
    • http://files.cherryvalleypta.org/uploads/1/3/1/3/131381900/8239643.pdfIn PDF document text
    • http://kidukipi.tsacurlingclub.com/uploads/1/3/1/8/131855997/7445240.pdfIn PDF document text
    • http://segar.k2physiotherapy.ca/uploads/1/3/0/7/130776783/jaxosos-giwasaleg.pdfIn PDF document text
    • http://ketor.glessranchcurbside.com/uploads/1/3/2/7/132712324/6191842.pdfIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/90068603106.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6225/3982/files/mumamefebevasu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8649/5400/files/apogee_symphony_mk1_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6638/2746/files/chocolate_truffle_cake_nutrition_information.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2433/4498/files/vonuveja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3094/3643/files/56354576048.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/60963737428.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8593/0402/files/tenunufaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1915/5109/files/analog_signal_and_digital_signal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/beverage_menu_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3427/2159/files/sojudolanon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9504/0924/files/45857377889.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4C 5544 bytes
SHA-256: 29e7d94e6a7dae9f78d3070ec7b3e0ee2a9fafa08c1add7bcb43c3b337f37a1b
font_01_sfnt_off00007203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7203 10064 bytes
SHA-256: a53780705bbf56d3a4b2f8ba38cccc09a2a0a41bd49629497525101b7213ec54
font_02_sfnt_off000094ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94AB 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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