Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a85d6423d4fd2c4…

MALICIOUS

PDF

49.5 KB Created: 2020-10-05 23:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9d1e81e0420a6e42e1d6393b31a570af SHA-1: 390c742e0fc0ae3afdce99c39bc73b57a4193c93 SHA-256: 7a85d6423d4fd2c4c3e458e30c49057c928dab6a2fdf0882971881e582095e0c
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a known malicious redirector. The ML classifier also flagged this PDF as malicious. The presence of numerous links suggests an attempt to lure users to malicious sites, potentially for phishing or malware distribution, aligning with spearphishing attachment tactics.

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://ggtraff.ru/strik?keyword=sonar.+coverage.+jacoco.+xmlreportpaths+multi+module In PDF document text
    • http://files.marycnasser.com/uploads/1/3/1/6/131637240/9589406.pdfIn PDF document text
    • http://files.reflexologylymphdrainage.co.uk/uploads/1/3/1/3/131384542/6894261.pdfIn PDF document text
    • http://files.missionadventuretours.com/uploads/1/3/2/6/132681352/6fff20fec.pdfIn PDF document text
    • http://files.just-verandas.com/uploads/1/3/2/3/132303282/3630784.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc52d56b-d0ab-4fc9-bb9a-4f4cce770b1b/98423677578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/619ee0a2-8c62-4558-a7f7-f24f03891f6c/kizopiduzimawewepisobalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c654ffa-2a70-4925-9ffc-5960c22d6cd6/3042341237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5688c385-b8d0-4ceb-aa8c-8d81c5565312/72991304278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5cdd4f0-8b92-41ab-9a36-4f3c625ec625/jalavul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1417/8984/files/96200889598.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0720/8355/files/heal_your_whole_body_reviews.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/8244/1638/files/www.keytrain.com_run_career_ready_101.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/5231/5036/files/50544702701.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7453/4558/files/bakery_story_hacks_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/8566/0828/files/60369661495.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2735/1717/files/where_did_metropcs_originate.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_off000071cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71CC 5828 bytes
SHA-256: 0e38109c3c4c31a43d577e87571ab3de20b9867cd15f21ea63f9e6496cf1ecf4
font_01_sfnt_off00008594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8594 16432 bytes
SHA-256: d5d626395f49c5a255a5d98748a49995ad9f98f3e0b1f1ad3223e7cc6f83a095

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