Malicious PDF — malware analysis report

Static analysis result for SHA-256 31df2c756868a618…

MALICIOUS

PDF

37.8 KB Created: 2020-07-29 04:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 45fdf75bc09c154c8087997317073940 SHA-1: f860e9678df74e64cad8acef23bd99573eab0ffd SHA-256: 31df2c756868a61805e5bb4e6c918944f7e686cae73348974653d1f98ae6491f
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on shopify.com. The document body, though heavily obfuscated, contains keywords related to 'iatf 16949 rules 5th edition pdf free download', suggesting a lure for users searching for this document. The primary malicious IOC is the redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/wb?keyword=iatf%2016949%20rules%205th%20edition%20pdf%20free%20download In PDF document text
    • http://files.kipandfriends.com/uploads/1/3/2/6/132681694/bafuvuzavubarosoto.pdfIn PDF document text
    • http://files.leejeffery.com/uploads/1/3/1/8/131871745/zefetefabugetuke.pdfIn PDF document text
    • http://files.mimismusic.org/uploads/1/3/0/7/130739971/4841589.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/1/0428/9835/8432/files/wojilezufaguxulidumusad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7922/7810/files/kasevowupawa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/33807590413.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1931/3053/files/44866476503.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90675932679.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/1334071498.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0119/2352/files/wafarapamojexuka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8157/3279/files/wabekat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6946/4991/files/watinuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/51269733111.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/nusuwotawizaweboli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5653/6479/files/xizisusuvatavasofogebin.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://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_off00005af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF0 5612 bytes
SHA-256: c1e0c65c45ddbf3135cbbdde314d931d47ccd4808f3ff77f85cc8c4b19f58224
font_01_sfnt_off00006e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E03 9476 bytes
SHA-256: 63557339c5eecc621395c15a45662df10c3a016c47ebefb1fc82f04b4697f58b

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