Malicious PDF — malware analysis report

Static analysis result for SHA-256 da837d762e38f09f…

MALICIOUS

PDF

44.2 KB Created: 2020-08-08 22:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 0647593bf45944476420b2ff601bde0b SHA-1: baec285acaad4b6a74c820224e4dc164ebb414db SHA-256: da837d762e38f09f02bf6db2dd5b38de55f37226eac681ecaffaf91137df6679
194 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links, many pointing to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector. The document body contains garbled text along with the URL 'https://ttraff.cc/pify?keyword=a+monster+calls+play+pdf', which is likely the primary malicious payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.cc/pify?keyword=a+monster+calls+play+pdf In PDF document text
    • http://files.cybercats5436.com/uploads/1/3/0/7/130739564/panefadufi.pdfIn PDF document text
    • http://files.clear-heater.co.uk/uploads/1/3/1/4/131438616/4273705.pdfIn PDF document text
    • http://mokulunol.blue-sky-coach.com/uploads/1/3/2/6/132695818/9817270.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3484/5079/files/zelibagefakevufexipik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3186/3202/files/lujumif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5804/4827/files/tuxasalezilorekidon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/zunijimipinifebome.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3684/3933/files/68644534064.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/tiriritabidafu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0890/9734/files/zifajeladapabodiwe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9656/4131/files/46245868849.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0829/4039/files/37118725895.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5345/7320/files/form_433_f.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nanejixiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2790/7239/files/biwopolituga.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_off00005a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A21 5392 bytes
SHA-256: fb6315d639135d8f11bd26601d56fe2df1d5e50349d2167f0aa94ead46260066
font_01_sfnt_off00006c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C69 9900 bytes
SHA-256: 385f10c14ad14da29763db70227ec0c59f630662b62870c6b3a133986c7d3add
font_02_sfnt_off00008e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E8E 16092 bytes
SHA-256: 2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140

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