Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c73bc62106dc8e9…

MALICIOUS

PDF

44.5 KB Created: 2020-08-11 15:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba08729c113d5ffb36995982a371a700 SHA-1: 631d69767bafc0f4d4d25828a974c69fb98c1d19 SHA-256: 0c73bc62106dc8e9a4a0ec2ced295e56215d161f427550034e48ed5cdbe2aedd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external resources, many of which are hosted on Shopify and appear to be part of a link farm designed to manipulate search engine results. One critical heuristic identified a link to a known malicious redirector infrastructure at `https://ttraff.cc/pify?keyword=12v+subwoofer+amplifier+circuit+diagram+pdf`. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to drive traffic to malicious sites.

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=12v+subwoofer+amplifier+circuit+diagram+pdf
    • http://somafa.agefriendlybethel.org/uploads/1/3/2/7/132712615/3605778.pdf
    • http://rowalat.pinkdazeeboutique.com/uploads/1/3/1/0/131071164/kadotisimekanav.pdf
    • http://vupimiw.chargerchoir.com/uploads/1/3/2/8/132814930/fe9958c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/5847/0810/files/92648979061.pdf
    • https://cdn.shopify.com/s/files/1/0439/2153/9240/files/xofilizovoren.pdf
    • https://cdn.shopify.com/s/files/1/0431/3966/1986/files/dadesojujufolo.pdf
    • https://cdn.shopify.com/s/files/1/0438/6455/5675/files/wigama.pdf
    • https://cdn.shopify.com/s/files/1/0433/8984/5671/files/wow_7._1._5_notes.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/25481156265.pdf
    • https://cdn.shopify.com/s/files/1/0431/1557/7504/files/online_converter_to_powerpoint.pdf
    • https://cdn.shopify.com/s/files/1/0430/0416/6297/files/94822684133.pdf
    • https://cdn.shopify.com/s/files/1/0447/8812/1760/files/95447382087.pdf
    • https://cdn.shopify.com/s/files/1/0433/6769/4501/files/83751297579.pdf
    • https://cdn.shopify.com/s/files/1/0429/0428/9439/files/jesekojabopupo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8900/2645/files/jokubuvamilet.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_off000061a7.bin
94a3bbb0e8fe03b17c59a972ef87b4a742270352d430354bed9ab3a3dd41c271		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61A7 5632 bytes
font_01_sfnt_off000074e1.bin
fc160577f2273d70162a7bb98b5d20c507e4565f4688f2a308203e7d71fb241f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74E1 9828 bytes
font_02_sfnt_off00009689.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9689 4324 bytes

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