Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c83beb6342a480…

MALICIOUS

PDF

41.1 KB Created: 2020-08-27 21:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a83dbbe1e44ab498cd2324a7e72ba85 SHA-1: a5b0c976f33f161df115fb6fe26589b5ceaf7758 SHA-256: 11c83beb6342a48093eb508362c800498d806287ea22351244930b87d1b740a0
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One prominent URL, https://ttraff.com/pify?keyword=poser+multiplication+%25C3%25A0+virgule, is flagged as a malicious redirector. The ML classifier strongly indicates maliciousness, and the presence of numerous links supports a social engineering attack vector.

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=poser+multiplication+%25C3%25A0+virgule
    • http://files.whyportugalnow.com/uploads/1/3/2/6/132696598/vozuje-nuwenibuxuweb-zipokuzugenopel-xonidudikos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/3137/8592/files/tinizodefo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6415/6575/files/70647162487.pdf
    • https://cdn.shopify.com/s/files/1/0445/6543/0431/files/advanced_excel_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/1399/5672/files/xaforonokatobidosaram.pdf
    • https://cdn.shopify.com/s/files/1/0436/3055/9390/files/kisaviwarunukuvejetoja.pdf
    • https://cdn.shopify.com/s/files/1/0429/2119/7724/files/runescape_bounty_hunter_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3531/files/kipojazar.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/13864639344.pdf
    • https://cdn.shopify.com/s/files/1/0465/0965/4174/files/roruvarudeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/1753/4629/files/98103763098.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5523/files/24158481609.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_off00005f0b.bin
a9975fd71b278634ac3b1fdf3b7091e63e09b68204c1c6ebd61c466c7aff09e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0B 5548 bytes
font_01_sfnt_off00007149.bin
959a8391ff3d7c5204bd0d18fcb174cf2c23f30321a48600ab71d911c1bfe49e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7149 11484 bytes