Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cabfbb142024b5…

MALICIOUS

PDF

43.5 KB Created: 2020-08-17 00:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d10b23e0bf98da6934f7cdf4ceb23e91 SHA-1: 3a8f252be29c9b937a456bf75d82326cee5ec896 SHA-256: a4cabfbb142024b5c8a137a04d7cf1630680340d101cbebf77b543b4fc486545
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a mass of external links, many of which point to a redirector service (ttraff.cc). The document body, though heavily obfuscated, contains the same redirector URL and other PDF links. This indicates a clear intent to redirect the user to malicious infrastructure, likely for phishing or malware delivery. The ML classifier also strongly flagged this PDF as malicious.

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=my+autograph+video+songs+free In PDF document text
    • http://files.scituateriltcc.org/uploads/1/3/1/8/131858540/f3bc8995de974ad.pdfIn PDF document text
    • http://files.stefaniazissi.com/uploads/1/3/1/4/131407493/mimebidu.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/1/0431/3900/6632/files/ruronel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2459/6642/files/jodavudedusulupoge.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/16097145570.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3274/6906/files/vuzovifumubesefupokufi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1658/5379/files/75024112794.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8624/2209/files/32470134623.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2502/2621/files/54862809505.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4361/7959/files/70236266777.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1748/3934/files/zinekubesikepor.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 2

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_off00006a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7A 5440 bytes
SHA-256: 100453bd0765acff6d31a15a12d1393c8e65b13638030e1f1f8daace8ec99822
font_01_sfnt_off00007d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D0B 11212 bytes
SHA-256: 9f757b9bedcab452d6996a81615ff1fa3928a0cfaa074fb31b358490f52239e1

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