Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba0f7f83011d1b1…

MALICIOUS

PDF

38.5 KB Created: 2020-08-27 20:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7b8f61f7f38d0c501e8082dcfd948a3 SHA-1: 93e66a40c509c67d98c7b3e7fba001b9a81e7408 SHA-256: 9ba0f7f83011d1b143720abe93de3e96ba9cc7969edf7c4cee8571674e7c4c4b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with 24 external PDF links, including a redirector to ttraff.com. The ML classifier strongly indicated maliciousness. The embedded URLs and the PDF structure suggest a lure to download further malicious content or redirect to phishing sites.

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.com/pify?keyword=fate+extella+controls
    • http://sudin.misiupapier.com.au/uploads/1/3/1/8/131857252/warusene-jorizefudewuf.pdf
    • http://files.nationalcapitalfencersclub.org/uploads/1/3/2/6/132680827/sokini.pdf
    • http://files.columbiadentcenter.com/uploads/1/3/0/9/130969910/jubegonakajij-desagomabof-sateno-pikilolot.pdf
    • https://cdn.shopify.com/s/files/1/0437/9197/4549/files/unfollow_on_instagram.pdf
    • https://cdn.shopify.com/s/files/1/0440/7335/3366/files/the_latest_research_ai_and_machine_learning.pdf
    • https://cdn.shopify.com/s/files/1/0447/9143/1325/files/odevzdn_bakalsk_prce_upol.pdf
    • https://cdn.shopify.com/s/files/1/0430/5246/6325/files/97590191542.pdf
    • https://cdn.shopify.com/s/files/1/0435/3140/3423/files/computer_networking_tutorial_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/48639033796.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8658/files/97885996650.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0296/files/cours_d_atomistique_l1.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2864/files/46085949412.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_off00005b15.bin
ebde50930f17e1aa8bd7aff4d619a8101e94998d73ba2ac443a69297a0d1acd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B15 4816 bytes
font_01_sfnt_off00006b84.bin
38dc63e5d3c445f47a9e8d7e3d283869e93e5de740876b385166111051b76c8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B84 10024 bytes

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