Malicious PDF — malware analysis report

Static analysis result for SHA-256 691288aff5a03f19…

MALICIOUS

PDF

66.2 KB Created: 2020-08-28 08:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b815e8776768a85c3cf3111ab009690 SHA-1: 6b6857dcf1be260cfc62badf0455597352514ad9 SHA-256: 691288aff5a03f19b8c21f0108edac62ef0b008f6327a3c330cfc14282900452
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 potentially malicious or unknown domains, suggesting a link farm or SEO spam tactic. One prominent URL, https://ttraff.ru/pify?keyword=bhojpuri+sohar+song, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection attempt.

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=bhojpuri+sohar+song
    • http://towujaru.pacingpics.com/uploads/1/3/0/8/130814328/rodev-xuzaxanarawaze.pdf
    • http://files.redwoodvisualarts.org/uploads/1/3/1/8/131856430/voladoveviz-tokoxeji.pdf
    • http://files.mysticgamermike.com/uploads/1/3/1/8/131871419/7009873.pdf
    • http://files.jpactm.org/uploads/1/3/0/9/130969364/c90ee8eaac684bc.pdf
    • http://files.themoveablechurch.org/uploads/1/3/0/8/130874128/9175303.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2525/3023/files/samsung_ml_2525_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/2034/4731/files/fesonuroxexuxolesi.pdf
    • https://cdn.shopify.com/s/files/1/0441/2764/9944/files/32750927512.pdf
    • https://cdn.shopify.com/s/files/1/0459/9375/4781/files/pentatonic_scale_guitar_licks.pdf
    • https://cdn.shopify.com/s/files/1/0434/2172/8930/files/laxijusaxotobawejede.pdf
    • https://cdn.shopify.com/s/files/1/0432/9717/7768/files/fitness_timetable_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/6719/6063/files/inelastic_and_elastic_collision_work.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/31600860792.pdf
    • https://cdn.shopify.com/s/files/1/0431/6158/3776/files/the_faerie_queene_characters.pdf
    • https://cdn.shopify.com/s/files/1/0437/7765/4942/files/fibexejub.pdf
    • https://cdn.shopify.com/s/files/1/0427/9821/9420/files/tefexokixanusuzupalaro.pdf
    • https://cdn.shopify.com/s/files/1/0431/1325/0972/files/56482710676.pdf
    • https://cdn.shopify.com/s/files/1/0435/4637/8404/files/67903722858.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_off0000b9fe.bin
435641b8f87ae3eb17ea2e861a96effbb820c5732264033824ad82821d1e4529		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FE 5172 bytes
font_01_sfnt_off0000cb98.bin
e969c4a751725e9b08c4812452b5b4ff9239925c90c65e8623366ecf1d2672e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB98 14988 bytes

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