Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a374f18bd54248…

MALICIOUS

PDF

43.1 KB Created: 2020-08-03 08:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: be50b9db9a307ace0e7ca0cfb4ac760d SHA-1: 3a5a0e1f3f3afe00180ebd31329e2f35716b48aa SHA-256: 21a374f18bd54248880a67bc851376d47d6858a27cbb02f4a212e9474460ea9b
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/pify?keyword=free+romantic+novel+pdf`. This URL is part of a link farm designed to appear as free content, likely to deceive users into clicking. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL and numerous other URLs hosted on `cdn.shopify.com` and various other domains, suggesting a broad distribution effort for potentially malicious content.

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=free+romantic+novel+pdf In PDF document text
    • http://files.samanthadasilva.com/uploads/1/3/2/6/132682640/miwide.pdfIn PDF document text
    • http://files.524kou.com/uploads/1/3/1/4/131437457/suvoxog.pdfIn PDF document text
    • http://files.trebor-ts.com/uploads/1/3/1/8/131871690/4fa93.pdfIn PDF document text
    • http://files.dragonchoirs.net/uploads/1/3/1/3/131380504/nebemebiber-gorik-fiwumoxunubowe.pdfIn PDF document text
    • http://files.ornamentsofexpression.com/uploads/1/3/1/4/131455883/vojosa.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/1/0429/4115/3439/files/read_incest_comics_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1177/6416/files/26621687700.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4253/6598/files/36968031072.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0222/5059/files/negurajenifuxegesine.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1030/7749/files/tesip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/48695885779.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2270/5063/files/16119785080.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7047/9772/files/astra_child_theme.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0390/3127/files/70748604439.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7881/9735/files/73906353379.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8062/3015/files/pobade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5951/0425/files/hp_laserjet_1536dnf_mfp.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3504/0664/files/35290976459.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC1 5136 bytes
SHA-256: d0c9ea09b36ad9f5e4afc9fdfef0039af68474a03b839b7bae6b0c95de5bca10
font_01_sfnt_off00007d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D2E 10088 bytes
SHA-256: d61c461f64564baa4e86cffd9d45924f86fc4ec5c7ec73eeb6f6e0154c47bbaf