Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf721924b9efd32…

MALICIOUS

PDF

43.5 KB Created: 2020-08-11 03:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f4c6b0040379dd03840c333a38bdff5e SHA-1: 3b3cc69126a3772bd9b083320c82d9b4a00746f8 SHA-256: 1cf721924b9efd32602d829e33146ea809eeb4e27624f74570c3db058a00ac53
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=kalender+2020+weeknummers+pdf, which is a primary indicator of malicious redirection.

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=kalender+2020+weeknummers+pdf In PDF document text
    • http://saluw.pcrsd.com/uploads/1/3/0/7/130738732/fazavuvobifub.pdfIn PDF document text
    • http://files.fischerandcardamone.com/uploads/1/3/1/0/131070971/9439029.pdfIn PDF document text
    • http://wivafima.artwing.ca/uploads/1/3/1/3/131398101/gegusisib_seromo_sinaxuk_nebitig.pdfIn PDF document text
    • http://bitor.mlkccnc.org/uploads/1/3/1/6/131606490/6966688.pdfIn PDF document text
    • http://files.whyriskit.ca/uploads/1/3/2/3/132303270/zadodilater.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/1/0434/1704/3111/files/19834584594.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rixozuxixewu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3913/5643/files/57710188411.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1075/2663/files/nivubemija.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2301/4824/files/typescript_tutorial_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0386/9346/files/60245771477.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2135/2606/files/audi_online_training.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1297/2963/files/63942912954.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4552/8487/files/adobe_photoshop_cs5_learning_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8854/2872/files/68713386162.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71340125447.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_off00005fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD5 5588 bytes
SHA-256: 266c06b9dfdf27bab19a12e9980bbf443874ab8f75f275d29fa9249bf0a2fcbb
font_01_sfnt_off000072d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72D0 14068 bytes
SHA-256: 7430d9c672a9c35258fb13e85e9e6755fcf78caa744c14d753ac8d7a2ac0130d

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