Malicious PDF — malware analysis report

Static analysis result for SHA-256 5819a7d5526aec5a…

MALICIOUS

PDF

43.8 KB Created: 2020-08-23 03:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5b96216eb096ef830b49115edf199688 SHA-1: e5120bf343c2c7f421352948a3402b9aa9f6aba4 SHA-256: 5819a7d5526aec5ab3b9d7823125a38e1e53947aac314946ecb590499370ce46
194 Risk Score

Malware Insights

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

The PDF contains a link farm designed to attract search engine traffic, with one prominent link pointing to a redirector URL. The document body, though heavily obfuscated, contains text that appears to be a lure for 'hungry shark apk apkpure'. The heuristic firings indicate the PDF is a malicious redirector and part of a link farm, suggesting a phishing or malware distribution attempt.

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.ru/pify?keyword=hungry+shark+apk++apkpure In PDF document text
    • http://files.salsmantour.org/uploads/1/3/1/4/131410952/matefiwi.pdfIn PDF document text
    • http://files.twc408.com/uploads/1/3/0/7/130775969/76ccfc1f20.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/1/0432/5661/0979/files/silamule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9593/2574/files/22784390552.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6598/9528/files/southwest_airlines_route_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9600/7065/files/kovajuji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3659/7654/files/18938264677.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5347/3189/files/75064985415.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5453/8656/files/676398953.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4243/0362/files/cancioneros_de_folklore_para_guitarra.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3355/8168/files/jufelekirologepakuwuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0444/2878/7878/files/brooklyn_nine_nine_season_6_complete.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

Related samples 4

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFE 5176 bytes
SHA-256: 817b87494c64d7ea447a022e0bc6a90a6bdea26c1f3be49a5c846f8d28d5e79f
font_01_sfnt_off00007e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E93 10504 bytes
SHA-256: e28e4489f300cf3aaefdf7ac2a42049379504467ac542ad7c7e9baa28661d1aa

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