Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b2efe787c5c6b1…

MALICIOUS

PDF

52.8 KB Created: 2020-08-12 12:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33e4a0ed4c0fe5158585f87aed2fc347 SHA-1: 0c7f20e0ffd203436f73997ec24402f4662ca885 SHA-256: d9b2efe787c5c6b190b286fd22624d813514556f3eff8b84fc08d0a7a035b98c
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lead users to malicious content. The document body itself contains numerous links to Shopify-hosted PDFs, likely part of a link farm to improve search engine ranking for malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL and link farm heuristics indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=basal+ganglia+hemorrhage+%25E0%25B8%2584%25E0%25B8%25B7%25E0%25B8%25AD+pdf
    • http://files.thesaffronkitchen.com/uploads/1/3/0/9/130969659/6241017.pdf
    • http://files.joeridubbe.com/uploads/1/3/1/4/131437657/954750.pdf
    • http://files.petrichorartanddesign.com/uploads/1/3/0/8/130814588/96b19ac28f46330.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/49893951296.pdf
    • https://cdn.shopify.com/s/files/1/0430/0092/2265/files/vakazugefagodefelebewo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3722/1276/files/79818708349.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/sujapebazuvojebej.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/xanozumopobevabe.pdf
    • https://cdn.shopify.com/s/files/1/0431/9579/3571/files/vosugedunimuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/7210/2301/files/cancer_de_pancreas_sintomas.pdf
    • https://cdn.shopify.com/s/files/1/0429/8378/4601/files/hernia_de_disco_fisioterapia.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fejatomamegebuwugibuvu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9812/files/xigijubeni.pdf
    • https://cdn.shopify.com/s/files/1/0434/9070/5573/files/bromatologie_cours.pdf
    • https://cdn.shopify.com/s/files/1/0435/9671/0047/files/64768170216.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060e3.bin
f7961336b554bdf46ca62ca2a911b51e7947994ec0646eaf38e8fe9a60143ff4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60E3 5212 bytes
font_01_sfnt_off00007259.bin
456e8b79e681fd38e6b9315293ef2ea25af600aa7263219fc988efe8eaa57f1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7259 6180 bytes
font_02_sfnt_off00008255.bin
04f120b86dc2766275f4d81a771596142a188c566548bb11e968bd8ce329a323		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8255 7096 bytes
font_03_sfnt_off00009543.bin
9da797de221a3db463ded6426e041cb6a7b5ee288b1a903e688c2c22dc042a0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9543 9352 bytes
font_04_sfnt_off0000b52f.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB52F 4324 bytes

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