Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61a6392b39b45c0…

MALICIOUS

PDF

43.2 KB Created: 2020-10-31 22:42:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3dc4904a05df81e39792d341152d6eb1 SHA-1: 91cfa8c07a60e542e54910accdfff52b7cfc951d SHA-256: d61a6392b39b45c026c50a1a60b8e96c21b2833442ab0f1c68ef2bb61ccc0c26
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, with a critical heuristic firing indicating it's a link farm pointing to malicious redirector infrastructure. The primary malicious URL identified is https://cctraff.ru/123?keyword=homing+pigeons+for+sale+for+dog+training, which is also flagged as a redirector. While no scripts were extracted, the structure and heuristics suggest an attempt to exploit PDF vulnerabilities or trick users into visiting malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://cctraff.ru/123?keyword=homing+pigeons+for+sale+for+dog+training In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387577/normal_5f92847288eb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_5f970809b7dd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392867/normal_5f956cffe1f2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384160/normal_5f9da605d7181.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/1/0505/3045/1628/files/murifu.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/past_tense_present_tense_exercises.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8167/8494/files/60645416545.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/refup.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/pevopexumanexifo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7831/2625/files/venomimetaxebirofegav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3139/6501/files/heart_and_mind_kodak_apple_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6304/0408/files/34252703489.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/48565161965.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3816/3623/files/potenid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2907/2552/files/78417310493.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/ratugerimiduwilem.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_off00006c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C23 5320 bytes
SHA-256: 2a07ab0c8f4d06697824e6a458a7f64f47d22d0fb4128d067bed5bc38184ea34
font_01_sfnt_off00007e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E23 9848 bytes
SHA-256: 710897010122d07f4afeb673af657eefd44b390ca56b8db3e0a2e929326d9385

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