Malicious PDF — malware analysis report

Static analysis result for SHA-256 0527a818acb4df72…

MALICIOUS

PDF

46.9 KB Created: 2020-08-30 11:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28d2c95bc54b6e4b81cbf72798e098e0 SHA-1: 1ce8de32637a0a498dea8d9975f4a708c1fa6f8e SHA-256: 0527a818acb4df7267abf5416102a1ca4a09f7d6b8167199000511dd19fed560
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to a redirector URL. The ML classifier strongly indicates maliciousness. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content or phishing pages.

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=where+the+sidewalk+ends+poem+meaning
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_8b233d4757c540bca3c746b29c17878a.pdf
    • https://static.usrfiles.com/ugd/2f8cea_f231efb7c21648de9e6618220e019996.pdf
    • https://static.usrfiles.com/ugd/2f8cea_ad94535a234547f892da76b9be618acf.pdf
    • https://static.usrfiles.com/ugd/e32576_1b0c80de4b09420fbfc1a83c7da947a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_c0f4b80d85d444b39ac73b639e11c68e.pdf
    • https://static.usrfiles.com/ugd/b3bc21_d819c0d156d64a4b8ca5c33601980340.pdf
    • https://static.usrfiles.com/ugd/ca32a8_b89aee4b65e44b33bdcdd16ee39e5f86.pdf
    • https://static.usrfiles.com/ugd/cc089a_a0b9bb26494441e8907e066c8b9d53c2.pdf
    • https://static.usrfiles.com/ugd/b48b60_222935d6ae024828812f39045b969fb1.pdf
    • https://static.usrfiles.com/ugd/b8c837_782299235530450c9058303eeaf824af.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_744a88bc93f446d3b58bd53e7336cddf.pdf
    • https://static.usrfiles.com/ugd/26481d_ae0af3f45f7f4b1d9d87cf4c8db28dc4.pdf
    • https://static.usrfiles.com/ugd/b8c837_72afa1aaed5841bea49eba5d42728094.pdf
    • https://static.usrfiles.com/ugd/b8c837_0688a98e90d147f7aaff97830ee47aa0.pdf
    • https://cdn.shopify.com/s/files/1/0431/5794/6522/files/pajipofosaki.pdf
    • https://cdn.shopify.com/s/files/1/0431/8514/3969/files/57880504595.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wupukibasabozuxijixosi.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_off00007903.bin
bc46c2e59155d29734540515d204c4aa985a9898c43a8164469be9fcea7b97bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7903 5540 bytes
font_01_sfnt_off00008bc4.bin
0ed3bab398fde3cc6f237836e1aceb64cb22d844249e1bfb234b32d36a7e5bff
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC4 10212 bytes