Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a66efe3ebf2816e…

MALICIOUS

PDF

43.1 KB Created: 2020-08-31 02:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c6f7f4cc6eeaa1e3fe31589318bccbc SHA-1: f899e43104cde1e83d8e2e581dfded8fc80863af SHA-256: 5a66efe3ebf2816ee768bfd5f2d0e94adfcec6aee130944c17160c96cd2a339d
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded artifacts suggest an attempt to disguise the malicious link as a book offer, likely to trick users into clicking it. The ML classifier also strongly flagged this PDF as malicious.

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.ru/wix?keyword=david+bach+books+amazon
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_6573bfaeffc24253bee62bc962877ac2.pdf
    • https://static.usrfiles.com/ugd/253000_a4b1a70ea94747f5b5bac4aa0a4ea06b.pdf
    • https://static.usrfiles.com/ugd/b8c837_901166200ca84c9492832501ae1e2cc4.pdf
    • https://static.usrfiles.com/ugd/48f461_3fb3b50e14f246898e3e6bcf7f42fdfe.pdf
    • https://cdn.shopify.com/s/files/1/0462/5429/3143/files/bekhayali_female_version_ringtone_zedge.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/67635225443.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9483/files/dezitabuda.pdf
    • https://cdn.shopify.com/s/files/1/0428/9842/3967/files/wulotelewijiratadatulegis.pdf
    • https://cdn.shopify.com/s/files/1/0441/3263/0680/files/pufisalidaxobogomemabeso.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/jibugirodovatifamafetinup.pdf
    • https://static.usrfiles.com/ugd/63022f_fa6b8fc4b8a14502aa0b00a421886dd5.pdf
    • https://static.usrfiles.com/ugd/0a593f_c201baf35c854ccd863b3650671bde09.pdf
    • https://static.usrfiles.com/ugd/07625c_bea321cf64614d02af12af8d2640966a.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_off00006ab7.bin
1d985e2dfd6e584dfefa9426c166e280f26bb0ac196cb9445d1b8a7ef1ba880c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB7 5364 bytes
font_01_sfnt_off00007ce1.bin
4d9806f01eb56b0a6465e3301d35d670b43746d9ee01da19fa03acecbbbfd7ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE1 10292 bytes