Malicious PDF — malware analysis report

Static analysis result for SHA-256 862ee0f2b16ee1c8…

MALICIOUS

PDF

41.3 KB Created: 2020-08-11 02:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f11223fab3d5258e4e26641b5de4847 SHA-1: 52e494f9e8dbc6726e6c1fe9f41060a9020ee4d2 SHA-256: 862ee0f2b16ee1c80c50719a827526249dea770899011560c357686cda187308
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 a link farm designed to redirect users to potentially malicious content. The primary malicious URL identified is ttraff.com, which is flagged as a redirector. The ML classifier also strongly indicated maliciousness.

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=%25C3%25A7eviriyle+ogren+pdf
    • http://files.bassreevesconference.com/uploads/1/3/1/6/131637362/876faf.pdf
    • http://files.singersandactorsworkshop.com/uploads/1/3/2/7/132740218/mubazaxumadajag.pdf
    • http://files.sulphursoccer.com/uploads/1/3/1/4/131437123/luvajoponasiwigo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2583/3882/files/simple_past_negative_and_interrogative_form_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0430/4394/6649/files/kigenirepuwazevodano.pdf
    • https://cdn.shopify.com/s/files/1/0431/6764/5857/files/jexidisina.pdf
    • https://cdn.shopify.com/s/files/1/0436/9294/9658/files/kavenogifufusubibofas.pdf
    • https://cdn.shopify.com/s/files/1/0435/3523/7269/files/dish_dash_milpitas.pdf
    • https://cdn.shopify.com/s/files/1/0437/2050/7546/files/zabasawol.pdf
    • https://cdn.shopify.com/s/files/1/0433/7834/4085/files/18756892695.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8274/files/subject_verb_agreement_exercises_grade_6.pdf
    • https://cdn.shopify.com/s/files/1/0433/2827/4582/files/95698364563.pdf
    • https://cdn.shopify.com/s/files/1/0433/0517/3147/files/cat_c15_service_manual.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_off000060d6.bin
df728a86e73cdf9252e823fd403aa3d1ea7beecd42c46497c67aa425c05160c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x60D6 5076 bytes
font_01_sfnt_off000071f2.bin
b7f72f93524234c4cb1af8cc6e13f863eafba2473a81be744b26bb02eee1985c
pdf-font-stream PDF embedded font (sfnt) at offset 0x71F2 12076 bytes