Malicious PDF — malware analysis report

Static analysis result for SHA-256 3412de3ec85fd5d1…

MALICIOUS

PDF

46.7 KB Created: 2020-08-04 22:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1a8873948b17203b0e0e8b63cfe93ea SHA-1: 802e78070827e6b42c776d3dd8774fbf39b8d230 SHA-256: 3412de3ec85fd5d165660656da89eab796c5029ad58e95f4155d4484dd96ef89
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a 'duplicate bill', a common lure for phishing or malware delivery. 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.ru/pify?keyword=bses+rajdhani+duplicate+bill+pdf
    • http://files.tcstactical.com/uploads/1/3/0/7/130775310/7165754.pdf
    • http://files.aspiringvirtuouswomen.com/uploads/1/3/0/9/130969960/wegifupim.pdf
    • http://files.anaturalselectiongsd.com/uploads/1/3/0/7/130775286/mimesiwami-lamatan-tuvimananiz.pdf
    • http://files.ecusaportraits.com/uploads/1/3/0/9/130969434/zaperozovoxijesa.pdf
    • http://webifol.stfrancismadisonchristlife.org/uploads/1/3/0/8/130874253/d662d128b48.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37872338034.pdf
    • https://cdn.shopify.com/s/files/1/0435/4323/2661/files/92202168733.pdf
    • https://cdn.shopify.com/s/files/1/0433/9643/2021/files/96894244988.pdf
    • https://cdn.shopify.com/s/files/1/0431/2314/6909/files/69470763039.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/gonodufekew.pdf
    • https://cdn.shopify.com/s/files/1/0431/0119/2352/files/97376043315.pdf
    • https://cdn.shopify.com/s/files/1/0434/3509/8264/files/tetumajaroroposod.pdf
    • https://cdn.shopify.com/s/files/1/0427/9903/8631/files/39592502715.pdf
    • https://cdn.shopify.com/s/files/1/0429/1103/9655/files/munupenakesepibapanuwamu.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006085.bin
6bc115aeb74b487b9632d80129e230a49837238c705dfbd9c291c016d825b6f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6085 5508 bytes
font_01_sfnt_off00007338.bin
f86b09a8c8b675495da308507d0c639afec90a8703a484d02bcdf2c2a959ba5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7338 11068 bytes
font_02_sfnt_off000098aa.bin
e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6
pdf-font-stream PDF embedded font (sfnt) at offset 0x98AA 16164 bytes