Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc331e8b44807a9…

MALICIOUS

PDF

48.6 KB Created: 2020-10-09 08:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 982ea65958693581b8c37672845bc17f SHA-1: b6d379e4a45ee305face62ad28bbed396ad9f69a SHA-256: 6bc331e8b44807a92932bf5929359aab8f995bf2f7831010469518691ed8ae95
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 benign resources, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL https://gettraff.ru/strik?keyword=behavioural+competency+framework+template, suggesting a lure to a malicious site. The presence of numerous external PDF links indicates a link farm strategy, likely to improve SEO for malicious content or to distribute payloads.

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://gettraff.ru/strik?keyword=behavioural+competency+framework+template In PDF document text
    • https://site-1040881.mozfiles.com/files/1040881/48562250893.pdfIn PDF document text
    • https://site-1041289.mozfiles.com/files/1041289/ridilajixevizo.pdfIn PDF document text
    • https://site-1037903.mozfiles.com/files/1037903/pizukoponolesawaxeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/2016/3478/files/highest_megapixel_camera_canon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6189/3533/files/cyber_shot_user_guide_rx100.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8741/6475/files/21_day_sugar_detox_food_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2745/5400/files/york_diamond_90_furnace_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b72c9207-50d6-45f8-a1e5-ba87bd0c49ed/2705758799.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70b97469-6eb6-4d1d-98e0-d36baf4a3e72/nezenigidam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85ec4114-24fd-4516-bf01-0ad2dfd1613b/54432739909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/047241f1-a590-4a00-af80-d72bfc186980/sojogibabogosumitegete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a661a21-fdc8-406c-a786-1ced7f1f903e/93184761052.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9147dc32-5228-46df-af42-24e773e0b360/17132373494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7799792f-adcd-4002-85e3-35bfd671c5c2/gofakizudavevajiperevisi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FAE 5444 bytes
SHA-256: 64f0750680ed320ec9502fbb44f6d7eedc54f260191c44dca8b8c1522dfa9f54
font_01_sfnt_off00009227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9227 10368 bytes
SHA-256: 00307bd7c8167f51125f2df0c357f21d2d44ffb89a68bf3d0038aa7dced94833

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