Malicious PDF — malware analysis report

Static analysis result for SHA-256 965df0e7bee7669c…

MALICIOUS

PDF

34.0 KB Created: 2020-08-14 01:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f30190b7fd458a2e8c020ce1b78cf92 SHA-1: 6c5dd0a47b5b8c73d7fd71bf6875efac6b0f3692 SHA-256: 965df0e7bee7669c9f31e7004fcb729cc1e219375bc71209b0e4cc06c51fdd7c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a link farm with 30 external PDF links, suggesting an attempt to distribute malicious content or engage in SEO manipulation. The ML classifier strongly flagged this PDF as malicious. The presence of the URL 'https://ttraff.cc/pify?keyword=words+formed+using+bowel' is a primary indicator of malicious intent, likely serving as a lure or a gateway to further malicious activity.

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://ttraff.cc/pify?keyword=words+formed+using+bowel
    • http://files.diskyoto.com/uploads/1/3/1/3/131379219/tovotofunemor.pdf
    • http://files.ewiechart.com/uploads/1/3/2/3/132302913/gomokiwu-dapewijutufose-jofumuvusu.pdf
    • http://files.campkuringgai.com/uploads/1/3/1/4/131453486/baxijepiv_pugulufomusobes.pdf
    • http://files.maddieleighphotography.com/uploads/1/3/0/7/130776763/nawilorarudezegubogo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9927/files/famifimexomosiranugo.pdf
    • https://cdn.shopify.com/s/files/1/0438/7130/5896/files/92359096705.pdf
    • https://cdn.shopify.com/s/files/1/0437/2204/7637/files/revised_atlanta_classification_for_acute_pancreatitis_a_pictorial_essay.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/jeruworaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/9054/2743/files/japetuj.pdf
    • https://cdn.shopify.com/s/files/1/0429/8702/8641/files/66563449389.pdf
    • https://cdn.shopify.com/s/files/1/0435/6639/9647/files/2567419725.pdf
    • https://cdn.shopify.com/s/files/1/0428/5366/2883/files/jezosanuzigabolilebokujuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/8640/5029/files/webewaze.pdf
    • https://cdn.shopify.com/s/files/1/0429/6677/8009/files/biology_mcq_questions.pdf
    • https://cdn.shopify.com/s/files/1/0437/3151/7605/files/11085760692.pdf
    • https://cdn.shopify.com/s/files/1/0429/5986/3961/files/66671351540.pdf
    • https://cdn.shopify.com/s/files/1/0431/6486/0575/files/knee_strengthening_exercises_for_runners.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004891.bin
d1a7bd47044a8b5a243ad394dfaa23cd198c434d267ca2edf024af90c4983de1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4891 5260 bytes
font_01_sfnt_off00005a7a.bin
8ce2b9a39b91a4d067ef57e0870a9d549b5c1b07efd97e19a63c01cddef24e70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A7A 9632 bytes

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