Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c832cc8e44c909…

MALICIOUS

PDF

32.7 KB Created: 2020-08-24 08:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92edc8bc02d8559df742a55bdfe3a728 SHA-1: 104c053f39f3c25b633dbccf5cc3a954d0d92bdb SHA-256: 88c832cc8e44c9093ee69317395121f63f8b4cae35788350b2f9bd7462abff75
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text and URLs that suggest a link farm or SEO spamming attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack pattern involves redirecting users to potentially malicious sites.

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=something+somebody+anything+anybody+exercises+pdf
    • http://loxole.calzadoleonsr.net/uploads/1/3/1/8/131857914/fajigitividu.pdf
    • http://files.inspiredemocracy.org/uploads/1/3/2/7/132712093/vaminov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0463/0645/9810/files/rirolupakovorovom.pdf
    • https://cdn.shopify.com/s/files/1/0440/6041/0006/files/brandon_grotesque_free_font_mac.pdf
    • https://cdn.shopify.com/s/files/1/0438/0455/7472/files/dovusirarotifaxemavi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/17724176773.pdf
    • https://cdn.shopify.com/s/files/1/0438/9660/2779/files/lutarivanokomakota.pdf
    • https://cdn.shopify.com/s/files/1/0432/5166/3012/files/advanced_vocabulary_words_and_definitions.pdf
    • https://cdn.shopify.com/s/files/1/0434/2077/8653/files/68456784408.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5274/files/11493172678.pdf
    • https://cdn.shopify.com/s/files/1/0432/0873/6928/files/90358266765.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_off00004244.bin
7fc955441a61f8701984694b0d9c399f03324b77c2d1fb871b5e1804bcd86bfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x4244 5948 bytes
font_01_sfnt_off00005663.bin
63db56e8d1922e62edab86906f800bf1b10a099c296d31414da18f15b4ab40f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5663 9344 bytes