Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3df6006f81e5b0…

MALICIOUS

PDF

40.8 KB Created: 2020-08-06 18:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d43420663ab319dbaa3555a83c79ce8c SHA-1: a96a0c91542e87652171ac8c6ad48c20ae7e544c SHA-256: 3a3df6006f81e5b06dbf41be1f3e904eea393cfbdb05c6baaf2aeb4fea1e73e6
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at 'https://ttraff.cc/pify?keyword=statistical+methods+by+n.+g.+das+pdf+free+download'. This indicates the document's primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=statistical+methods+by+n.+g.+das+pdf+free+download
    • http://files.truth-publishing.com/uploads/1/3/1/4/131453215/386420.pdf
    • http://files.brennencooper.com/uploads/1/3/1/1/131164100/773b5e37a.pdf
    • http://files.arlenhancockactor.com/uploads/1/3/2/3/132302992/7416984.pdf
    • http://files.elgi-algheroaccommodation.com/uploads/1/3/1/4/131482874/5f63ba72fd2.pdf
    • https://cdn.shopify.com/s/files/1/0434/4247/1064/files/pujiditabetupiwuvifod.pdf
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/azox_500mg_bula.pdf
    • https://cdn.shopify.com/s/files/1/0431/5919/1712/files/68754353883.pdf
    • https://cdn.shopify.com/s/files/1/0431/6820/2901/files/wumoguvefovamazodaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/1279/2221/files/widupaguzun.pdf
    • https://cdn.shopify.com/s/files/1/0433/8325/9301/files/99341892484.pdf
    • https://cdn.shopify.com/s/files/1/0431/4539/6386/files/9714366209.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3681/files/sesifaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/4299/5352/files/lavozipo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0134/7226/files/jspdf_autotable_cdn_link.pdf
    • https://cdn.shopify.com/s/files/1/0431/3976/0285/files/riwiranekerafema.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/dakozokodawegozuxetes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050ef.bin
980f5a8ac648d09025a6d245f684260043cabe73e16be863464af668483b80bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50EF 5824 bytes
font_01_sfnt_off0000649a.bin
b18b230501a811fe383c7be999b389e5b3050c64e067f91e8b085988901131dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x649A 10292 bytes
font_02_sfnt_off000087a8.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87A8 4324 bytes

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