Malicious PDF — malware analysis report

Static analysis result for SHA-256 717f3e7a97391708…

MALICIOUS

PDF

43.2 KB Created: 2020-08-07 23:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f92f305531f3f5fe34a2a9fbc761c514 SHA-1: 69d73f3e717e2917169f380c1f246031106613cb SHA-256: 717f3e7a9739170871db4a5cc83cf5811b833319088e7d0cc92429a22b38d090
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 external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent link, 'https://ttraff.com/pify?keyword=story+book+for+learning+english+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL, indicating a lure to redirect users to malicious content. 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.com/pify?keyword=story+book+for+learning+english+pdf
    • http://files.bradleystokejudo.com/uploads/1/3/1/8/131871786/botagosajutikefuwe.pdf
    • http://xaworizan.saharjoakim.net/uploads/1/3/1/4/131438641/4012a1.pdf
    • http://files.blissbeautytruro.co.uk/uploads/1/3/1/6/131606598/5999612.pdf
    • http://files.filebankinc.com/uploads/1/3/1/4/131454316/9820046.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7691/9194/files/mubenuteripiletede.pdf
    • https://cdn.shopify.com/s/files/1/0435/6361/4369/files/minecraft_vanilla_chunk_loader.pdf
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/music_box_dancer_piano.pdf
    • https://cdn.shopify.com/s/files/1/0431/3055/2474/files/bacteriologia_basica.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1081/files/49738814605.pdf
    • https://cdn.shopify.com/s/files/1/0431/6931/7020/files/xojuwasatorilix.pdf
    • https://cdn.shopify.com/s/files/1/0438/7025/7320/files/27363240000.pdf
    • https://cdn.shopify.com/s/files/1/0447/8962/9085/files/manasquan_surf_report.pdf
    • https://cdn.shopify.com/s/files/1/0428/7833/7187/files/18982240061.pdf
    • https://cdn.shopify.com/s/files/1/0430/8775/7461/files/90338920657.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96672573922.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45484104345.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_off000069ff.bin
5ed070336ab0cd576fc2e1d18fc1025a7ef96aa98019eb79ed55fd61cdfd9078		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69FF 5712 bytes
font_01_sfnt_off00007d71.bin
53d738886f9e18059570b6a81d4d582303aeb8c0bfaff9624297612f158c9498		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D71 10088 bytes

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