Malicious PDF — malware analysis report

Static analysis result for SHA-256 203a2d9689954182…

MALICIOUS

PDF

42.8 KB Created: 2020-08-04 15:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 091f9465aae23a2b4ffb09c274195169 SHA-1: ba92ebaf2a91246ad47235e860ad8dde7edf8053 SHA-256: 203a2d968995418224b83b3de50ae9b365a767d5cf094fbcd154e829f5106b1c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector, 'ttraff.cc', which likely serves as a gateway to further malicious content. Another critical heuristic noted a large number of external PDF links, predominantly hosted on Shopify, suggesting a potential SEO manipulation or link farm tactic. The document body is heavily obfuscated and contains the redirector URL, indicating it's part of the malicious infrastructure.

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=probiotic+bacteria+list+pdf
    • http://files.mrsprusik.com/uploads/1/3/0/7/130739835/344921.pdf
    • http://files.zimengmusic.com/uploads/1/3/1/4/131408798/powijilijaxirekuxed.pdf
    • http://files.novemberceleste.com/uploads/1/3/0/8/130874598/netivu.pdf
    • https://cdn.shopify.com/s/files/1/0441/1287/1576/files/crafting_calc_rs3.pdf
    • https://cdn.shopify.com/s/files/1/0438/1140/5986/files/56197993517.pdf
    • https://cdn.shopify.com/s/files/1/0437/1247/9382/files/23591622062.pdf
    • https://cdn.shopify.com/s/files/1/0427/5824/2470/files/wezigakirofukenafe.pdf
    • https://cdn.shopify.com/s/files/1/0431/5955/2155/files/31858760278.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/95612041296.pdf
    • https://cdn.shopify.com/s/files/1/0429/1385/7692/files/45512650930.pdf
    • https://cdn.shopify.com/s/files/1/0432/1371/7662/files/32656440850.pdf
    • https://cdn.shopify.com/s/files/1/0435/6423/6968/files/brother_sewing_machine_jx2517_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/2960/1175/files/diablo_2_lod_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/1813/3405/files/puzavujaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/8962/4224/files/pesomelesibipano.pdf
    • https://cdn.shopify.com/s/files/1/0431/7013/6218/files/pekuk.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069a0.bin
c4c1d57e6349fa61775ed87b085e575794073c4497491b619cc3d5575547d463		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A0 5288 bytes
font_01_sfnt_off00007ba5.bin
ffe39ae2f916dbeaba955fbf5e91c7375e6e0c09c9a81425194aa16ffed17b65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA5 10208 bytes

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