Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0b81b25c257516…

MALICIOUS

PDF

41.7 KB Created: 2020-08-02 15:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e64857dde0d868a84b3f5f277ef5775 SHA-1: 203b7686d3e33de40433757e38c92665ca18f356 SHA-256: 4a0b81b25c257516da2d7c2466d10e95b8e873c9e22ebc635c019408d313a4a3
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large external link farm. The ML classifier also strongly indicated maliciousness. The document body contains the URL https://ttraff.cc/pify?keyword=mary+carey+xxx, which is a known malicious redirector. The primary attack pattern is likely to lure users into clicking these links, leading them to potentially malicious sites.

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/pify?keyword=mary+carey+xxx
    • http://files.lacuencadelriopiedras.com/uploads/1/3/0/7/130740175/dezun.pdf
    • http://files.aldorle.com/uploads/1/3/1/8/131856380/896b810a.pdf
    • http://files.finstofeatherstaxidermy.com/uploads/1/3/0/7/130740118/f4ec7a9e5efcb.pdf
    • http://files.coleenparatore.com/uploads/1/3/1/0/131069950/buvosanigisatupo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2376/1571/files/bufedazezegagal.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/16318193966.pdf
    • https://cdn.shopify.com/s/files/1/0427/7141/5196/files/40115630530.pdf
    • https://cdn.shopify.com/s/files/1/0432/2341/6987/files/94106954968.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/benifesikazitisukitobiv.pdf
    • https://cdn.shopify.com/s/files/1/0439/4660/6760/files/for_each_c.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8401/files/vavewisimuposolanulirabur.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5682/files/xubopawipojowixu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0309/files/jepubedarojilamarip.pdf
    • https://cdn.shopify.com/s/files/1/0430/7091/4717/files/55258218958.pdf
    • https://cdn.shopify.com/s/files/1/0436/3590/0569/files/98351943365.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3415/files/32429291635.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d8c.bin
020d299b1974714f28cc369b4211acaa60e0786496e9660b40e22bf06b2845a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D8C 4756 bytes
font_01_sfnt_off00005dd8.bin
a1c68180eae955d710b1f59d89b7b5bb1f22246194deffa7b9c3298859733f9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD8 2140 bytes
font_02_sfnt_off000067b0.bin
d7c34dc6b9120d63cf96a74c060b4f5e239b256fb9508b6147f95994313826c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B0 15584 bytes

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