Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc94a995a14361ac…

MALICIOUS

PDF

130.9 KB Created: 2021-01-10 09:12:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b1a78eef9409082a34c4a588bc15c158 SHA-1: 2b143ea0684ae18dc174613ac25464a92b7cb436 SHA-256: cc94a995a14361ac87355c2a2a1ee79fa6c9ec77bb82d185b9d4fe8fd9ecedac
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to redirect users to malicious content. The primary redirector URL is 'https://traffking.ru/aws?utm_term=chickamauga+lake+fishing+reports', which is flagged as malicious. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of multiple PDF links indicates a strategy to distribute potentially harmful content through a network of linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffking.ru/aws?utm_term=chickamauga+lake+fishing+reports In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382790/normal_5f9a807307e91.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarasam/ZgdiftU/59528920344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370073/normal_5f9531d5f0f6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404290/normal_5fd1d0e478319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417123/normal_5fa5f3957f573.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374951/normal_5ff7fb643d974.pdfIn PDF document text
    • https://cdn.sqhk.co/gotofebelu/bghQPDG/general_knowledge_quiz_questions_and_answers_multiple_choice.pdfIn PDF document text
    • https://site-1180269.mozfiles.com/files/1180269/free_television_app_for_android_phones.pdfIn PDF document text
    • https://site-1174179.mozfiles.com/files/1174179/watch_hockey_apple_tv.pdfIn PDF document text
    • https://jumekurokenawuw.weebly.com/uploads/1/3/0/7/130739991/38026c.pdfIn PDF document text
    • https://litabunor.weebly.com/uploads/1/3/4/5/134522775/979041.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496148/normal_5fdf887e3e023.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B603 5400 bytes
SHA-256: 0524904e255c3294e4f54fae802dc6826e0c76bdb515ae98e8f3837cdf336d40
font_01_sfnt_off0001c835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C835 11732 bytes
SHA-256: 7012dd028a658f45f4c0ed319a9aa2e8a1f658947d95c727cb16daff6abad95b
font_02_sfnt_off0001f03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F03C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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