Malicious PDF — malware analysis report

Static analysis result for SHA-256 649a41fe2cbf3cb3…

MALICIOUS

PDF

43.2 KB Created: 2020-08-30 10:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c1d2ee3fde477e6d94afcedde07e641 SHA-1: 0d2417cd100722e731e3342eef1e4d13f0969098 SHA-256: 649a41fe2cbf3cb3059c08ac520a8ab17fe5800fe2bd64acdcdf4dbedc5612b2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a primary URL pointing to a redirector, disguised as a download for cracked software. The ML classifier strongly indicates malicious intent, and the presence of numerous external links suggests a SEO poisoning or link farm tactic to distribute malware. No scripts were extracted, but the document body and heuristics point to a social engineering lure.

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.com/wix?keyword=avs+video+editor+7.5+crack+free+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/d775a9_5fdb4bfdfab74040aed1d87680f9b0f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_41cd3becc36648eb92556877ce68099e.pdf
    • https://static.usrfiles.com/ugd/e4ff69_6388fa110a1249b3a3059dc1e6744ca9.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_420bf9f17e07409594a616c26b5fbb54.pdf
    • https://cdn.shopify.com/s/files/1/0429/5458/8316/files/fimadibazegi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6680/9765/files/arma_3_getpos.pdf
    • https://cdn.shopify.com/s/files/1/0432/8436/5476/files/vodumu.pdf
    • https://static.usrfiles.com/ugd/b8c837_9bec7f00dfa645c18488ffa75b96729d.pdf
    • https://static.usrfiles.com/ugd/4b874d_779eb4c4f6d344668d09452748555630.pdf
    • https://static.usrfiles.com/ugd/227d0f_5fe0dd69d62443ca907c86e4e8ffeedd.pdf
    • https://static.usrfiles.com/ugd/0511f5_33d027cec0db4bb28b9dbbaaabcecb25.pdf
    • https://static.usrfiles.com/ugd/784815_c3c437494fb94d56af9c265a76c66b97.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/2014_harley_touring_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/7035/7661/files/tesatojazoxajaxilebef.pdf
    • https://cdn.shopify.com/s/files/1/0430/1789/6089/files/tegugafu.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_off00006985.bin
db75c82e1d38ef596fafe69b7ed478063100f784d8e030067e246b7cc247de73
pdf-font-stream PDF embedded font (sfnt) at offset 0x6985 5456 bytes
font_01_sfnt_off00007c4d.bin
3aabd7f4917869499f15cddc8ee178f3080708941f7a1dec8f37b51da491d4ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C4D 10360 bytes