Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d94bb6a7227a183…

MALICIOUS

PDF

36.1 KB Created: 2020-09-06 06:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b913147ff9f0d3557f2bf2eb2d874413 SHA-1: 2dfca44720839fd57d304faae018ed2efab8a016 SHA-256: 5d94bb6a7227a183e20bc3b90525fda15b8b6abd797f42f67032c265ac82a320
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 Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation or traffic redirection. One prominent URL, 'https://ttraff.ru/wix?keyword=press+democrat+arrest+reports', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL and benign-looking PDF links.

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/wix?keyword=press+democrat+arrest+reports
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7237/3411/files/jobs_vocabulary_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0437/6444/9437/files/91993179036.pdf
    • https://cdn.shopify.com/s/files/1/0433/0225/6795/files/lixo_organico_e_inorganico.pdf
    • https://cdn.shopify.com/s/files/1/0431/9395/8560/files/aviation_safety_management_system.pdf
    • https://cdn.shopify.com/s/files/1/0431/7986/8320/files/12903108685.pdf
    • https://cdn.shopify.com/s/files/1/0429/0831/9903/files/gta_iv_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0431/6551/5933/files/nopobebedizebaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/7012/8277/files/bone_markings_anatomy.pdf
    • https://static.usrfiles.com/ugd/95089d_588e89a243744deb848898463963d525.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_22180cc50f00424a821887710f107808.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed2e180409194f98bff96c534e57243b.pdf
    • https://static.usrfiles.com/ugd/2f3216_d3bdf51d25cd47b1b387a37fc2e798ff.pdf
    • https://static.usrfiles.com/ugd/d902bb_e83559d4ba51466982022f43de8ad521.pdf
    • https://static.usrfiles.com/ugd/73c254_57d0648a7db744e881fc07f04aee3ed5.pdf
    • https://static.usrfiles.com/ugd/3d0627_379604392b34401b8f5dbb0f33343a6f.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_off000050bd.bin
93c789407d79265ec668b3d77125578f065bf68e1dbe644f5d2c08ae8d57a38b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50BD 5188 bytes
font_01_sfnt_off00006245.bin
b001276ad7742b2e965b3fc9db240e6ef213b0b38d8942ccef8a5776879f29b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6245 9808 bytes

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