Malicious PDF — malware analysis report

Static analysis result for SHA-256 748f28be06b8f27a…

MALICIOUS

PDF

56.5 KB Created: 2020-09-14 19:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d89f9cc59ca8e0d20ddadbaf17a27083 SHA-1: b1d5a8b8295050e26109f5f16cda179380260df7 SHA-256: 748f28be06b8f27afce74afd537cc323e46d9ae27b28675885640f1725a4d668
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 suspicious domains and are flagged as a link farm. One prominent URL, 'https://ttraff.me/pify?keyword=sierra+marine+parts+cross+reference', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to these links, suggesting a phishing or malware distribution 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.me/pify?keyword=sierra+marine+parts+cross+reference
    • http://vavedi.asaphteachingministry.com/uploads/1/3/1/4/131482975/c8fe382e4bf5.pdf
    • http://bonefu.barbarafoxart.com/uploads/1/3/0/7/130740433/1d1da5da.pdf
    • http://files.semperparatuspelli.com/uploads/1/3/1/3/131380440/votilufavudanevu.pdf
    • http://dexidoro.isolahandmadeoriginals.com/uploads/1/3/0/9/130969521/4480132.pdf
    • http://fabapa.vernonrive.com/uploads/1/3/1/4/131454683/joget.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7120/1695/files/77813835387.pdf
    • https://cdn.shopify.com/s/files/1/0435/5915/7921/files/90552568107.pdf
    • https://cdn.shopify.com/s/files/1/0439/7151/0430/files/pexeridoxezil.pdf
    • https://cdn.shopify.com/s/files/1/0430/0449/3987/files/23632273551.pdf
    • https://cdn.shopify.com/s/files/1/0432/3331/2925/files/minecraft_manual_mob_farm.pdf
    • https://cdn.shopify.com/s/files/1/0429/3646/7619/files/61906011823.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/17724107752.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7645/files/biligotej.pdf
    • https://cdn.shopify.com/s/files/1/0429/0379/7916/files/20538903470.pdf
    • https://cdn.shopify.com/s/files/1/0430/5823/3493/files/60116334674.pdf
    • https://cdn.shopify.com/s/files/1/0434/0239/5813/files/vipuwekonigaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/1565/8920/files/xixavumofiwasuwerimedok.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009591.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9591 2828 bytes
font_01_sfnt_off00009f8c.bin
6bf662f24a5af036d2e1590a73760962fca1f9460f40840dbf5cf2200f92ebd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F8C 5232 bytes
font_02_sfnt_off0000b142.bin
5f3fea72eab8bf3a63eafb43d01609a7609903eb7eb85e4954ef1b5920efff6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB142 9840 bytes

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