Malicious PDF — malware analysis report

Static analysis result for SHA-256 00177a72fdf9ec73…

MALICIOUS

PDF

106.6 KB Created: 2020-10-31 12:51:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c1743e219b0d4137a91bf59fec4f9442 SHA-1: 1d875bbc0f52c080ba9c124c6b0ebbfc014d89d7 SHA-256: 00177a72fdf9ec73c5af3cfd6d08f4cc8ba8f0762337def6999d9b7a7caeaae9
214 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific link to a redirector, which is also used in a credential phishing lure impersonating Amazon. The ML classifier strongly indicates maliciousness. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to lead the user to a malicious site for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/6431815.pdf.
  • 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.link/123?keyword=navy+performance+summary+record In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_5f9cc7b954d1a.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/6431815.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/1/0498/7663/1710/files/dazimebofolul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0508/3424/3749/files/vejozat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9225/4105/files/le_petit_prince_vk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f239100c-4cef-402c-8171-51cb9493e941/17646568477.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/63019282164.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f35a156-5929-4e10-8189-ae095c3b3de2/kafiganamorinokem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/9403/1516/files/murigeletenilopabumexegak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/6442/5146/files/65479482981.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_off000166e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166E4 5400 bytes
SHA-256: 495106619a06a8f796fb122e9df376bd28f8e0930d050abf7619d98056b0809f
font_01_sfnt_off00017943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17943 10536 bytes
SHA-256: c6b2af6d2bc8b8758cd9e8051eed17d1fe335d219443c8ca0cc1b118f3c34bc6

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