Malicious PDF — malware analysis report

Static analysis result for SHA-256 844c17a62eb9a0eb…

MALICIOUS

PDF

44.6 KB Created: 2020-09-16 17:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c04a770bc0fd5e387b7b49589e9244b8 SHA-1: f74d14708a0d11ec1664d1a8a6ae820fb3bc3e93 SHA-256: 844c17a62eb9a0eb8dae42ae1973070ef1bc1ccf62de20b834434f13f1443d8e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, identified as a link farm, designed to redirect users to malicious sites. One prominent link points to a known malicious redirector infrastructure, suggesting a phishing or scam attempt. 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.me/wix?keyword=free+dating+sites+in+usa+and+canada+without+payment
    • http://maveresuz.cornerstonecowboychurch.org/uploads/1/3/0/7/130738765/vopovumadawamaf.pdf
    • http://files.cofhhe.org/uploads/1/3/0/8/130814861/2040862.pdf
    • http://files.metropolitanperformingarts.org/uploads/1/3/0/9/130969712/e1fd4bff4.pdf
    • http://files.artesanfruit.com/uploads/1/3/0/8/130814346/gapafigabeponu.pdf
    • http://files.theturquoisepalms.com/uploads/1/3/0/7/130776291/771643.pdf
    • http://rajasa.cestarifreshlamb.com/uploads/1/3/1/3/131398134/7852980.pdf
    • http://nezudizif.andyhartsphotography.com/uploads/1/3/1/4/131408027/5baf5e35a9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jomanumono.pdf
    • https://cdn.shopify.com/s/files/1/0433/7739/3815/files/arcade_fire_ep.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/tafovovebivebosekelimenet.pdf
    • https://cdn.shopify.com/s/files/1/0430/3034/7938/files/treatise_on_invertebrate_paleontology_bivalvia.pdf
    • https://cdn.shopify.com/s/files/1/0430/6596/6754/files/92374035917.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/cara_pengendalian_gulma_bayam_duri.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/69474661204.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_off00006db1.bin
f820e72229d02a50ff89c27dea525df0f32ac7087db9d3b7be9746d5556258fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB1 5604 bytes
font_01_sfnt_off000080b5.bin
7b28ab707c4111ec9454e64444a5fd6cf6fae39cdeed4079789b0c84ab39a6d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x80B5 10752 bytes