Malicious PDF — malware analysis report

Static analysis result for SHA-256 13943ed338076f85…

MALICIOUS

PDF

40.1 KB Created: 2020-08-17 15:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 957df618d8d930a4d9c0d9c93f22aa72 SHA-1: 0117dad21655c04261df6d47f1fba0e0b5fd49c3 SHA-256: 13943ed338076f852b5503c6c7ffaf80ca7dbc57cc456bcb2bd0efff6eb987eb
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, includes a URL that is also present in the embedded links, suggesting a coordinated effort to direct users to external sites. The presence of a link farm heuristic further supports the conclusion that this document is designed to manipulate search engine results or distribute malicious content.

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/pify?keyword=bible+study+guide+for+young+couples
    • http://files.thebridgeriohondo.org/uploads/1/3/1/3/131379792/sosajigafi.pdf
    • http://duvunoxum.jetvideoonline.com/uploads/1/3/0/8/130814328/mimabitigugokes_jefomexos.pdf
    • http://luxosuti.piratewalks.org/uploads/1/3/1/8/131856158/funefifo_kosibezenafapon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1094/9273/files/jemeleladusaxuvutu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/vonufozutunonatudesipizes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dusegu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3030/5175/files/13810444594.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/12377014130.pdf
    • https://cdn.shopify.com/s/files/1/0438/5813/3152/files/rubegifavifi.pdf
    • https://cdn.shopify.com/s/files/1/0437/1061/1607/files/2413589107.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2469/files/66598349427.pdf
    • https://cdn.shopify.com/s/files/1/0433/3663/0422/files/50538934718.pdf
    • https://cdn.shopify.com/s/files/1/0431/3301/0082/files/3435623576.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9432/files/437899693.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_off00005d99.bin
e81457d1a3664d48e958cdf15995875a6b7693f53d7c09e4bbd021c1bac27fa8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D99 5404 bytes
font_01_sfnt_off00007009.bin
b56e669125bc2fcb5adeef1811ff88e5530902d1c01d58f688a118467d615e03
pdf-font-stream PDF embedded font (sfnt) at offset 0x7009 10352 bytes