Malicious PDF — malware analysis report

Static analysis result for SHA-256 304c49482beeb3bb…

MALICIOUS

PDF

35.2 KB Created: 2020-09-05 14:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 193bff9b60ca00da6834658c970c8b68 SHA-1: 55e59131b28a2f5b32e470a529ca6cab0aacc4b8 SHA-256: 304c49482beeb3bbdd89f189644b38fee50f7018d626f08b2663475100621c0e
152 Risk Score

Malware Insights

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

The PDF document contains a link disguised as interview questions and answers, which redirects to a known malicious domain. The ML classifier strongly indicated maliciousness, and the PDF structure includes a large number of external links, suggesting a link farm or redirection tactic. No scripts were extracted, but the primary attack vector is the malicious redirector.

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=claims+adjuster+trainee+interview+questions+and+answers
    • https://static.usrfiles.com/ugd/3826db_e76329a8af8549f190d64c912e8eaa4b.pdf
    • https://static.usrfiles.com/ugd/954c8b_2ec73fc3273846f2bd0c36db1e9f8e0e.pdf
    • https://static.usrfiles.com/ugd/353d00_24171b114cda46d5aa4a12fb2f77e2ec.pdf
    • https://cdn.shopify.com/s/files/1/0435/3681/0135/files/74855303163.pdf
    • https://cdn.shopify.com/s/files/1/0432/1571/6516/files/16011906506.pdf
    • https://cdn.shopify.com/s/files/1/0437/8922/2037/files/arms_race_mod_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/8579/0358/files/dezokutabik.pdf
    • https://cdn.shopify.com/s/files/1/0431/0715/6128/files/bankers_adda_august_month_current_affairs.pdf
    • https://static.usrfiles.com/ugd/b8c837_03e93a710bbd41b5a475f81a60c99f3b.pdf
    • https://static.usrfiles.com/ugd/a7074a_7430115f8990451a9d0af79413c04144.pdf
    • https://static.usrfiles.com/ugd/95ea6b_0d8a40424a0d47658bc053818c9bf1bb.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004dd2.bin
8c19e90b996395bdf7c8bbf1367b3a5a2fa3471a8abc36dcaf13d6e66cdb5a70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DD2 5228 bytes
font_01_sfnt_off00005f91.bin
1e8a95cc630c7c186f313fff22d1ddd7221167eac37d95644316db9fb206b83a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F91 9532 bytes

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