Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c2b2997150ef37…

MALICIOUS

PDF

38.6 KB Created: 2020-08-13 22:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cb89750badad2ffa10a9a1b65c212a52 SHA-1: fad305f357dc0c9eef7708869683b893a71bf3e3 SHA-256: 55c2b2997150ef37e2d0a485a87d437a32b97c1ccc38d43b314ee0ccd9b4ad2b
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 of which are part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The document body contains text related to an album and metadata indicating it was generated by wkhtmltopdf, suggesting a potential SEO manipulation or redirection scheme rather than a typical user-facing lure.

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=a+twist+in+my+story+album In PDF document text
    • http://files.aprilgentry-sutterfield.com/uploads/1/3/0/9/130969714/1201640.pdfIn PDF document text
    • http://files.floristrycentral.com/uploads/1/3/1/3/131381352/kuporutek_wogad_remow_baxini.pdfIn PDF document text
    • http://files.listerrentsequipment.com/uploads/1/3/1/4/131438418/ed7df869b91.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/1/0432/3049/4878/files/jilejexobesaselesotel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2421/9288/files/39040536724.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5911/8229/files/79397349444.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0522/2822/files/jijukefokenipejikosix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6240/1947/files/lirikolopowevipujoje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3161/6918/files/77841973135.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0704/9877/files/74752761052.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9585/8088/files/levemilo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4922/0256/files/zopibaguzabesikeg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2473/3592/files/rikazutemeta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6957/1233/files/zifopugere.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_off00005965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5965 5156 bytes
SHA-256: 0818497eed591c5d99eb314dc196335cb72ad985eba71efa5b04d403fedd3003
font_01_sfnt_off00006adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ADB 10248 bytes
SHA-256: da2ec83056c8e60922c6618198b1ed68f1f49347597d420447ed247a200b4aa2

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