Malicious PDF — malware analysis report

Static analysis result for SHA-256 123431a8b31f3c9f…

MALICIOUS

PDF

44.7 KB Created: 2020-08-12 00:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ef9b48ca2601cdf6bac93fc34cf58a3b SHA-1: e82a0a523968f7bc29fe2aa329c1d9508a4753f2 SHA-256: 123431a8b31f3c9fec1e69f60b08ae797403a2498b81e507e49736917c95bcf7
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though obfuscated, contains text suggesting it is a 'solution manual', likely a lure. The ML classifier strongly indicates maliciousness, and the presence of numerous external PDF links further supports a malicious intent, likely for SEO manipulation or phishing.

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=introduction+to+categorical+data+analysis+solution+manual+pdf In PDF document text
    • http://files.keithgriffithssquash.com/uploads/1/3/0/7/130776743/3906400.pdfIn PDF document text
    • http://files.miam-foundation.org/uploads/1/3/1/8/131856815/13e1f0.pdfIn PDF document text
    • http://files.bodilheggo.com/uploads/1/3/0/9/130969705/werekugexa.pdfIn PDF document text
    • http://files.ccnaacademy.com.au/uploads/1/3/0/7/130739996/77c436.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/1/0430/9785/0017/files/32169128255.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1821/3797/files/collections_in_java_interview_questions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4017/8333/files/wivimede.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2318/7616/files/causes_of_tumor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6310/6968/files/64629651394.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/tefelunefisuburuzeludogev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0564/8801/files/96800983840.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4186/6403/files/pokemon_adventures_sun_and_moon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5448/7969/files/how_to_add_user_on_mac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7235/6514/files/20252462807.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0800/8090/files/66038782091.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 8

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_off00006fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA8 5512 bytes
SHA-256: 68897e72e476f9b6ae6892fed2b295024d4868453275c53dcc0005eeef25deac
font_01_sfnt_off00008254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8254 10204 bytes
SHA-256: a74d7ca83809ba68ba7d80ca544187bc5e9e9cee1a5f754fac0d8a18c69bd6af

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