Malicious PDF — malware analysis report

Static analysis result for SHA-256 209863312fba7b98…

MALICIOUS

PDF

45.4 KB Created: 2020-08-21 11:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f70949a52d91a79995f42ff31aaa4158 SHA-1: ebe73a0581488cb1642b712f097fef20fad3ec2c SHA-256: 209863312fba7b986cbb1250ed75537c39ce44843c5213807139cf832426b917
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=basketball+games+free++for+android'. This URL is designed to lure users with a seemingly innocuous topic. The document also exhibits characteristics of a PDF link farm, with numerous external links, many hosted on cdn.shopify.com, suggesting an attempt to distribute malicious content or engage in SEO abuse. The ML classifier strongly flagged this PDF as malicious.

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=basketball+games+free++for+android
    • http://files.crookeddoorstudio.net/uploads/1/3/1/3/131379591/b5173181.pdf
    • https://cdn.shopify.com/s/files/1/0433/1533/1227/files/62311821142.pdf
    • https://cdn.shopify.com/s/files/1/0434/3840/7832/files/34204434703.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/12658810506.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/sulerevipawokul.pdf
    • https://cdn.shopify.com/s/files/1/0436/6372/0613/files/53087996940.pdf
    • https://cdn.shopify.com/s/files/1/0432/1994/3579/files/35387018578.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lozafawofife.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/absence_letter_for_school.pdf
    • https://cdn.shopify.com/s/files/1/0433/9263/0940/files/cambridge_primary_english_stage_1.pdf
    • https://cdn.shopify.com/s/files/1/0430/7750/1095/files/boberofo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1297/files/cours_sur_le_cercle_trigonomtrique.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1824/files/rivugonomebepasut.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_off000072d1.bin
018d6d4ad5ba13082675684bfbd5dc549ba5c54eebfb54eb64f1ab6fb588633a
pdf-font-stream PDF embedded font (sfnt) at offset 0x72D1 5480 bytes
font_01_sfnt_off00008560.bin
0e6e9dd1bb8038353d722a52925f184ad5662b7bfcf8b181600e6aaf12aa73f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8560 10604 bytes