Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a2e1d56aa4ac51…

MALICIOUS

PDF

46.9 KB Created: 2020-08-06 18:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 182d0faeb8568760fac16b46030ea39f SHA-1: 37f34a80eea3887e84fb77a952563180744c526a SHA-256: 91a2e1d56aa4ac514cc7a0b149064ecd072e0e35c6507867fb29e16d881106f2
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including a critical redirector link to 'ttraff.com', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'data structures and algorithms' and the malicious URL, reinforcing the lure. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports malicious intent.

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.com/pify?keyword=data+structures+and+algorithms+in+python+paperback+2020+pdf In PDF document text
    • http://files.homecareproviderservices.org/uploads/1/3/1/0/131069886/6483655.pdfIn PDF document text
    • http://files.themysticgrounds.com/uploads/1/3/0/7/130739772/4585869.pdfIn PDF document text
    • http://munut.loneezyvisionz.com/uploads/1/3/1/3/131383664/jilujotagelomavodes.pdfIn PDF document text
    • http://files.lbnaz.org/uploads/1/3/1/8/131856158/3066370.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8212/0357/files/68476222371.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9246/7109/files/zorudadof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2174/5825/files/83430208102.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9289/2061/files/pawosakalut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9204/2137/files/nazusa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/9199/0430/files/66077551510.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/88101905250.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75130531250.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/84385748293.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8670/7876/files/1940164294.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1382/4927/files/leladibemixofep.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 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68F5 6028 bytes
SHA-256: d328edc5b8c2c1d92a1b31e0b89905d06e9d36680c9f4494afcaa57493489cd0
font_01_sfnt_off00007d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D55 10276 bytes
SHA-256: 3a318fd39c83b8d49b9b567b2b97ffee31f756ae60f08ea5949788a2bf23cfc6
font_02_sfnt_off0000a046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA046 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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