Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad39e51c0d4c7cc…

MALICIOUS

PDF

64.0 KB Created: 2020-08-28 02:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00a5e08283af732c96f425a819876c22 SHA-1: c9f60be9682acc40ac14052e28d70e2def1f36b2 SHA-256: 6ad39e51c0d4c7cc2acccc17751a74368b4220bbf04b591d9bf432571716df33
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic firing indicating a link to known malicious redirector infrastructure. Additionally, it features a link farm of multiple external PDF links, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL.

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.link/pify?keyword=caged+bird+poem+answers
    • http://files.neenahpowerlifting.com/uploads/1/3/1/6/131636843/sibakerimam_lilopesamir.pdf
    • http://zesumuw.lgheartministries.com/uploads/1/3/1/0/131071157/c6467.pdf
    • http://sexupil.susanrydberg.com/uploads/1/3/1/8/131856887/1edacb26.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/8513/5014/files/40569473273.pdf
    • https://cdn.shopify.com/s/files/1/0446/0979/8307/files/vipezenovotu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0437/0842/files/noida_map_sector_wise.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/sufekomagarob.pdf
    • https://cdn.shopify.com/s/files/1/0432/1571/6519/files/60886014407.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/fonurereraka.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7721/files/18489949753.pdf
    • https://cdn.shopify.com/s/files/1/0429/2293/4435/files/rawemerivesasikatel.pdf
    • https://cdn.shopify.com/s/files/1/0430/9676/8661/files/sofilixirorogixuwamofi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b156.bin
d28a52d004f4d3c4da57631c96053457a5e8531d4d48c960376bcb4b06d2f88d
pdf-font-stream PDF embedded font (sfnt) at offset 0xB156 5212 bytes
font_01_sfnt_off0000c2ec.bin
bb731ae8d5819a1d7d48ce32c5ef756fc0655612c694563a7d78247ecccb622a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2EC 10108 bytes
font_02_sfnt_off0000e551.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 4324 bytes