Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f7091dfd4825bd…

MALICIOUS

PDF

51.9 KB Created: 2020-08-21 08:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31ec1913ecd2541cabfc84c047fa115a SHA-1: 379bdc9f1d0f900c40b19c1df8eaea48d29cccc6 SHA-256: a8f7091dfd4825bdcd002469f06d5a1472f847210979cf90635f792a090a4a71
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various PDF files, many hosted on Shopify. One of the primary links redirects to a known malicious redirector (ttraff.cc). The ML classifier strongly flagged this PDF as malicious. The document body is heavily obfuscated and contains the malicious redirector URL, suggesting an attempt to drive traffic to malicious infrastructure.

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=knowledge+matters+fashion+answers
    • http://files.plantopartyorlando.com/uploads/1/3/1/6/131636819/3098372.pdf
    • http://files.changeforhealth.net/uploads/1/3/2/3/132302859/laderamamadixiwitof.pdf
    • https://cdn.shopify.com/s/files/1/0429/6183/0037/files/discord_isn_t_detecting_my_mic.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/bupovixetogokogefuloj.pdf
    • https://cdn.shopify.com/s/files/1/0434/6278/7237/files/nojotipof.pdf
    • https://cdn.shopify.com/s/files/1/0432/5317/0334/files/sugijema.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tavolotifejenirogamofiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1140/files/zepupifigurejulejisurunam.pdf
    • https://cdn.shopify.com/s/files/1/0432/7702/5446/files/12117305827.pdf
    • https://cdn.shopify.com/s/files/1/0432/1758/4283/files/2006_bmw_325i_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4622/files/8183460083.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_off00008c29.bin
893467ec2ca7f1dd6147cb68551f6e7ca9673ca2424f454291ff36bc3d9dc9dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C29 5384 bytes
font_01_sfnt_off00009e5c.bin
e1926b9e319754e03fb7eef26309345498cb83a746bef138714aa219b9973c22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E5C 10736 bytes

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