Malicious PDF — malware analysis report

Static analysis result for SHA-256 64721fb864f12d81…

MALICIOUS

PDF

46.7 KB Created: 2020-08-31 14:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83884f9a0d7953cab1e2f32d28799522 SHA-1: ec7eb07aa014de06d44ee328eea721d71c28f80d SHA-256: 64721fb864f12d819e27a232aa7759bce18acffba760ef195220bf8c3032f3bd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, with one critical heuristic identifying it as a malicious redirector. The primary malicious URL, 'https://ttraff.cc/wix?keyword=chain+maille+jewelry+workshop+pdf', is likely used to lure victims into downloading further malicious content or visiting phishing sites. The document body itself is heavily obfuscated and contains the malicious URL, suggesting an attempt to disguise its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/wix?keyword=chain+maille+jewelry+workshop+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/8692/0347/files/canterbury_tales_middle_english.pdf
    • https://cdn.shopify.com/s/files/1/0440/1269/9798/files/guardian_chinese_novel.pdf
    • https://cdn.shopify.com/s/files/1/0436/0670/4290/files/free_ashampoo_winoptimizer.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7349/files/minecraft_immersive_railroading_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/2946/2165/files/cs_go_dragon_lore.pdf
    • https://cdn.shopify.com/s/files/1/0432/0673/8079/files/29475709690.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64830269039.pdf
    • https://cdn.shopify.com/s/files/1/0437/5874/7800/files/vusiviguvipizejenadipufe.pdf
    • https://cdn.shopify.com/s/files/1/0432/6857/1299/files/nigalimuvososanok.pdf
    • https://cdn.shopify.com/s/files/1/0459/6341/1616/files/wekizerezamoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/1464/4127/files/nulameruso.pdf
    • https://cdn.shopify.com/s/files/1/0432/8092/4837/files/70916053488.pdf
    • https://cdn.shopify.com/s/files/1/0427/7963/9967/files/4062490598.pdf
    • https://cdn.shopify.com/s/files/1/0428/5480/9759/files/conjunctions_list_and_usage.pdf
    • https://cdn.shopify.com/s/files/1/0434/4214/3389/files/40989372157.pdf
    • https://cdn.shopify.com/s/files/1/0431/7829/5450/files/68817498873.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077d7.bin
ad043d6d4662eec91d519b3eaeb908b8b520084adca3dc504041de5c7c79ee9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77D7 5520 bytes
font_01_sfnt_off00008a8a.bin
8e4c1997a1448392b2c7631ae22478927b463085098b560d2e56145918ae30e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A8A 10528 bytes

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