Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d108dad6644b77…

MALICIOUS

PDF

47.4 KB Created: 2020-07-16 19:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 316f13df56be2f303f8abfcb47e23c4a SHA-1: aeab85ab7d4916ab3e8b8b2bbfafd16c1cc5f6f6 SHA-256: 76d108dad6644b77b0a0cf8e48d1dcd73944aa89742d55da941a04aa5647c9b6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to WordPress.com hosting PDF files, suggesting a link farm or SEO abuse tactic. One critical heuristic indicates a link to known malicious redirector infrastructure at 'ttraff.ru', which is likely the primary malicious component. No scripts were extracted, and the document body is heavily obfuscated, making it difficult to determine the exact user-facing lure.

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/wb?keyword=icecap%20gyre%203k%20manual
    • http://files.rentkutztown.com/uploads/1/3/2/8/132814996/1968.pdf
    • http://files.streetambitionunited.com/uploads/1/3/0/8/130874122/9a06ab8.pdf
    • http://files.marshfieldalumni.org/uploads/1/3/0/7/130775647/42dc2a91d.pdf
    • http://files.bampilates.com/uploads/1/3/1/4/131438741/1940dcd9a51.pdf
    • http://files.sacpb.org/uploads/1/3/1/3/131380158/mugezobedasa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://watodumid.files.wordpress.com/2020/07/kefafojimekapep.pdf
    • https://xerepawuge.files.wordpress.com/2020/07/gepada.pdf
    • https://bisapabak.files.wordpress.com/2020/07/59570103688.pdf
    • https://fajebatisik.files.wordpress.com/2020/07/dakevatek.pdf
    • https://suvasebe.files.wordpress.com/2020/06/gojuguwex.pdf
    • https://vudepefa.files.wordpress.com/2020/07/62379980832.pdf
    • https://rotodiduluf.files.wordpress.com/2020/07/fuboramuvijuxatomu.pdf
    • https://sukodowo.files.wordpress.com/2020/06/gosulevaledunozin.pdf
    • https://cdn.shopify.com/s/files/1/0431/2167/2341/files/28043031734.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0811/files/86164480123.pdf
    • https://cdn.shopify.com/s/files/1/0427/3651/7286/files/18369913972.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/lujuduxesep.pdf
    • https://cdn.shopify.com/s/files/1/0428/7833/7187/files/1108165770.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/widufuxomidopevemi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/11722114664.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_off00007b01.bin
d076b3c2b0e22da89f9580f797aa6c66cc19124063b68010fe34ba43eedd972e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B01 4988 bytes
font_01_sfnt_off00008bda.bin
bc8d762792b784af5b1dd5be264987f344cd5f3211b4603a2c689f24f7d016cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BDA 10772 bytes

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