Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b1e4223d15abeb…

MALICIOUS

PDF

41.0 KB Created: 2020-08-25 21:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7bd45b17c9a24a9302c4d69a10b42f9 SHA-1: ae2d0963e860f355de3d31cc113d6c0570944945 SHA-256: 18b1e4223d15abeb395c7d49785bc2bca61b081b720dc1142bde615efa97dcd2
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body and embedded links suggest a potential SEO spam or link farm operation, possibly intended to drive traffic to malicious sites or distribute further malware. While no scripts were directly extracted, the PDF structure and embedded links are indicative of malicious intent.

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/pify?keyword=the+defining+decade+meg+jay
    • http://litobofu.southmadisonunite.org/uploads/1/3/1/4/131409236/tamirodetew.pdf
    • http://komaxumu.columbusdogconnection.com/uploads/1/3/2/7/132712663/kafefak.pdf
    • http://files.howtobeaweddingofficiant.com/uploads/1/3/1/4/131482823/juriresejasosatofu.pdf
    • http://files.berghutteskiclub.com/uploads/1/3/1/4/131484133/nawiro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9345/1159/files/fundamentals_of_computer_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/9718/5701/files/rekinus.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/83384281681.pdf
    • https://cdn.shopify.com/s/files/1/0430/4368/4503/files/pidelisezirimipex.pdf
    • https://cdn.shopify.com/s/files/1/0431/1285/7754/files/charged_quartz_crystal_gw2.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/smok_alien_220w_tc_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/2422/0321/files/45817526128.pdf
    • https://cdn.shopify.com/s/files/1/0429/1988/7001/files/72971692343.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2667/files/18357407145.pdf
    • https://cdn.shopify.com/s/files/1/0437/1555/9573/files/vitukegupek.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_off00006340.bin
cd56d11b21de5937306122aae8d15ce0fbdbf79f98007a6f8f56d49ef401f15e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6340 5256 bytes
font_01_sfnt_off00007507.bin
d104309d950674e42eb91c532d4670767843cf06b989a7017460dda4cb6326e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7507 10024 bytes