Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b0f905aee58f338…

MALICIOUS

PDF

40.5 KB Created: 2020-08-31 21:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59199cb209f52918979323215dbe3d81 SHA-1: 3cc72e4c40ba490c0155aacc0e5e5d601a2b9fb5 SHA-256: 6b0f905aee58f3385b4e1e38ec324acb3276eae6d470c12f16c2881129d02be8
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 a link farm hosted on Shopify. One of these links, https://ttraff.ru/pify?keyword=synaptics++windows+7, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to 'Synaptics windows 7' and the malicious URL, suggesting a lure to trick users into clicking the link. 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.ru/pify?keyword=synaptics++windows+7
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/0149/4179/files/nogexolegufomar.pdf
    • https://cdn.shopify.com/s/files/1/0434/8156/3286/files/napogolo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0386/2440/files/72286604720.pdf
    • https://cdn.shopify.com/s/files/1/0433/1782/1605/files/how_do_i_uninstall_uplay_launcher.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2084/files/13989089636.pdf
    • https://cdn.shopify.com/s/files/1/0432/6080/5280/files/fevipukugaxixa.pdf
    • https://static.usrfiles.com/ugd/dcfb95_abf9b35e5082488981339ad6daf92f8c.pdf
    • https://static.usrfiles.com/ugd/278743_5aee0fe967a74ec5a530e34ae61b4a9a.pdf
    • https://static.usrfiles.com/ugd/0cd019_32ed66da43dc4c61a22d727eac8160b4.pdf
    • https://static.usrfiles.com/ugd/7598fa_fdcfe1e8417a44b5999fd0a9b4ced2f1.pdf
    • https://static.usrfiles.com/ugd/34ec99_ea8733e2cbcc4b28be321ff5d6654078.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_off000053eb.bin
82cfa680896cadb339ad816b790b3fefa84428ada9552bc71c0b30866652a2aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x53EB 4984 bytes
font_01_sfnt_off000064f8.bin
478eebc4922afc96a8dd1f06890a6099743bdf69c99cccadad520e435677089d
pdf-font-stream PDF embedded font (sfnt) at offset 0x64F8 10160 bytes
font_02_sfnt_off000087b8.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x87B8 4324 bytes