Malicious PDF — malware analysis report

Static analysis result for SHA-256 8615e39a73650d98…

MALICIOUS

PDF

38.3 KB Created: 2020-08-16 14:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6bf23f5c5fdfab4b27056507b6bef40 SHA-1: 077e314c7f66a74cb3867b5ffa949ba6f57684d8 SHA-256: 8615e39a73650d9827f8f671dd159b4582ec58abe09899b95a6c0741e0e4cc49
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector, ttraff.com, which is used to lure victims with a 'chess game for android apk' pretext. The ML classifier strongly indicates maliciousness. The embedded URLs suggest an attempt to drive traffic to potentially malicious sites, likely for further exploitation or phishing.

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=chess+game++for+android+apk
    • http://bagizu.thepatchworkunderground.com/uploads/1/3/0/8/130814788/gogedunaxunefikuroko.pdf
    • http://files.juniperlactation.com/uploads/1/3/1/1/131164358/65fe128.pdf
    • http://files.rifg.org/uploads/1/3/0/8/130813362/74ecc7addb38076.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/3943/8486/files/95852421003.pdf
    • https://cdn.shopify.com/s/files/1/0433/3853/0965/files/kifekolem.pdf
    • https://cdn.shopify.com/s/files/1/0441/0513/8328/files/manual_hydraulic_hose_crimper.pdf
    • https://cdn.shopify.com/s/files/1/0439/0679/3627/files/64488397943.pdf
    • https://cdn.shopify.com/s/files/1/0435/5588/1119/files/manualidades_con_cajas_de_carton_de_leche.pdf
    • https://cdn.shopify.com/s/files/1/0430/0183/9775/files/84516386332.pdf
    • https://cdn.shopify.com/s/files/1/0431/0564/8791/files/57537838577.pdf
    • https://cdn.shopify.com/s/files/1/0437/0300/9434/files/veranuxeruval.pdf
    • https://cdn.shopify.com/s/files/1/0432/4048/9122/files/69372133701.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5397/files/43192430368.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/xafon.pdf
    • https://cdn.shopify.com/s/files/1/0435/8907/5102/files/60305526146.pdf
    • https://cdn.shopify.com/s/files/1/0437/9800/3874/files/the_human_mind_book.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_off00005728.bin
b03e0ee61e4c6fcff0809e6383efc491fad7426415bfac15f646ce46e4f84041
pdf-font-stream PDF embedded font (sfnt) at offset 0x5728 5392 bytes
font_01_sfnt_off0000695d.bin
5d74787c588c18967c0380d71a5b71069b6693c8193bb6b2d2cad4c2b83cd6fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x695D 10216 bytes