Malicious PDF — malware analysis report

Static analysis result for SHA-256 b121eb72a733d41a…

MALICIOUS

PDF

42.2 KB Created: 2020-08-16 00:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d33830cb78a36e569dc2a63ac7e43ef9 SHA-1: c83705657231ee6f88e1d7ed6f1f5936331b1c65 SHA-256: b121eb72a733d41a9f8b9ff7c6fbba2aed2c6f4d1cc09d380c4d468a10d731ec
202 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector link pointing to a URL that attempts to lure users into downloading a fake Adobe Acrobat Reader installer. The document body and embedded URLs reinforce this lure, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and linked URLs are highly indicative of a malicious download lure.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=adobe+acrobat+reader+11++offline+installer In PDF document text
    • http://vuwowatis.spokanedrumlessons.com/uploads/1/3/1/8/131871390/ziwesosamezelol-bexagivogokafi-nokix-naxarilaza.pdfIn PDF document text
    • http://files.twohandsrescue.org/uploads/1/3/1/4/131407877/18d68b9c.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/1/0431/5208/1053/files/zakuvapuxiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77160317291.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7316/6744/files/tijereluje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4621/4564/files/classroom_newsletter_templates_free_printable.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8135/0820/files/twitter_gif_to_phone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7743/4525/files/37639877517.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3492/6495/files/pekiwofojepefulogox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6741/5457/files/pdf_agama_hindu_kelas_11.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7923/6774/files/vasejisenurejujefonugugo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4169/2570/files/reximujuta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6259/9583/files/noun_pronoun_adjective_verb_adverb_conjunction_preposition_interjection.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/talk_yourself_better.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 5

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_off00006701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6701 5196 bytes
SHA-256: 583cf2851a6b9ddd4000f3af96f84ef73c68db295ec2565ffcd8bf0f677cbc55
font_01_sfnt_off000078ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78BA 10196 bytes
SHA-256: 0b1b671aedf4a5b7a17efc4b52ab1d2499d9f16041ee888a8db45e49adbee290

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