Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6b3a6f1924e690…

MALICIOUS

PDF

44.5 KB Created: 2020-08-12 15:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 108a02ff6c30c2cc135a81692a34503f SHA-1: 6e06b08051df5aebeeff44b3afa5c5746aee766a SHA-256: ef6b3a6f1924e6906f7141599d9e6dc14efd71591a999528e18af489440368a4
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The presence of a large link farm suggests an attempt to manipulate search engine results or distribute malicious content through seemingly benign documents.

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/wb?keyword=kruss%20polarimeter%20manual
    • http://files.coloresalonstudio.com/uploads/1/3/2/3/132302735/d9964486a53.pdf
    • http://monevap.tsceramics.com/uploads/1/3/1/3/131398244/xajokidodipoxagip.pdf
    • http://tufojera.rearviewthis.com/uploads/1/3/2/6/132682646/2928708cf3e.pdf
    • http://files.coaching-planet.com/uploads/1/3/0/8/130874554/8237006.pdf
    • https://cdn.shopify.com/s/files/1/0428/4334/0956/files/58736898747.pdf
    • https://cdn.shopify.com/s/files/1/0433/4154/5626/files/alter_ego_b1_cahier_d_activits.pdf
    • https://cdn.shopify.com/s/files/1/0435/6040/3103/files/tinotewazuvadan.pdf
    • https://cdn.shopify.com/s/files/1/0433/2827/4585/files/sewedukipexor.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bizisumexu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8553/7175/files/35065135089.pdf
    • https://cdn.shopify.com/s/files/1/0434/7448/5400/files/vapilejobisurasinax.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3001/files/nacionalismo_mexicano.pdf
    • https://cdn.shopify.com/s/files/1/0432/5107/3174/files/affordable_housing_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/4420/8789/files/47892670619.pdf
    • https://cdn.shopify.com/s/files/1/0429/1523/3959/files/avengers_watch_online.pdf
    • https://cdn.shopify.com/s/files/1/0432/0215/0557/files/sutijub.pdf
    • https://cdn.shopify.com/s/files/1/0451/0665/9493/files/secured_copy_text.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_off00006f8c.bin
4b33b37ad335e6677d960085b3ab5b8219b2c8cebe090c4761f7fe4afb5520e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8C 4936 bytes
font_01_sfnt_off0000803f.bin
c12eef954526077b0ec34c0d9334eb29d60c3f8b5702d85e07d283209b8f9b9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x803F 10780 bytes