Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ffcb6deb4c16f2…

MALICIOUS

PDF

39.1 KB Created: 2020-08-17 14:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5a1b17f16213dd790256cc1df3a16cf SHA-1: 33a2dd93207a9f29219e73729e0829e5867a0a4d SHA-256: 79ffcb6deb4c16f2025cf66f8c8b8bd51a8d8af8c3041f882bfc2b17f4bbdd75
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains the same suspicious URL, suggesting an attempt to lure users to malicious content. No scripts were extracted from this sample.

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=kevyn+aucoin+sensual+skin+enhancer+shade+guide
    • http://wigef.evelineverhulst.nl/uploads/1/3/1/3/131383483/mozolovuxaki.pdf
    • http://molez.paradiselawngarden.com/uploads/1/3/1/4/131453501/kudikomerabopeninulo.pdf
    • http://files.jamicurtis.com/uploads/1/3/0/7/130776162/mimuxodu.pdf
    • http://razunobu.mrsorchard.org/uploads/1/3/1/3/131380397/9179585.pdf
    • http://files.madonnaforinspiration.com/uploads/1/3/2/3/132303134/856400.pdf
    • https://cdn.shopify.com/s/files/1/0437/0923/5353/files/cengage_physics_for_neet_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0437/7228/0981/files/wepoken.pdf
    • https://cdn.shopify.com/s/files/1/0437/1942/6198/files/bupolubemovu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7015/2088/files/58164306652.pdf
    • https://cdn.shopify.com/s/files/1/0429/5609/5644/files/kabat.pdf
    • https://cdn.shopify.com/s/files/1/0431/7069/3284/files/chalk_uchicago_edu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2982/1600/files/43830709347.pdf
    • https://cdn.shopify.com/s/files/1/0428/8649/6415/files/ravifixemipe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4441/3341/files/ayn_rand_philosophy_who_needs_it.pdf
    • https://cdn.shopify.com/s/files/1/0450/3424/2198/files/cakephp_tutorials_point.pdf
    • https://cdn.shopify.com/s/files/1/0438/6439/1845/files/carmilla_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5509/files/jafemejotewa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0925/3281/files/jitubazuxedekitafime.pdf
    • https://cdn.shopify.com/s/files/1/0435/9172/9309/files/sociologia_definicion.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a84.bin
26c0f730a7f70da32e260878f846ebb5061f774db3ca1dd3b92c522c106cf269		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A84 5396 bytes
font_01_sfnt_off00006ce2.bin
6a9787186808211c036d253c9172569da2c1fb0704ad097f8ab6dd21ad9f74bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE2 10040 bytes

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