Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7409dd5ee5e042c…

MALICIOUS

PDF

57.2 KB Created: 2020-08-02 15:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d494555e2facc13eb1a8d9a027a554e9 SHA-1: 6209781690959483f683b2b6c1192ed62a791e28 SHA-256: b7409dd5ee5e042c97bab4ea6b48395ade094d2b325b08226948549b5d248d6e
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/pify?keyword=fma+brotherhood+opening. Another critical heuristic indicates a PDF link farm, with many links pointing to Shopify-hosted PDFs, suggesting an attempt to obscure the true malicious destination. The document body contains garbled text but includes the same malicious URL and several Shopify URLs.

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.ru/pify?keyword=fma+brotherhood+opening
    • http://files.firstchristianvinton.org/uploads/1/3/2/7/132740997/kanifapix_limolekuma_bitupupopiw_wavotoraka.pdf
    • http://files.graciejiujitsurocks.com/uploads/1/3/1/4/131414743/5771398.pdf
    • http://files.thelafs.com/uploads/1/3/1/3/131383763/neravos.pdf
    • https://cdn.shopify.com/s/files/1/0433/1238/2117/files/51760096914.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/mavoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5893/files/bafatumevefizevavu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kefemomorevogik.pdf
    • https://cdn.shopify.com/s/files/1/0431/0132/3421/files/putimebu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8106/2813/files/31535507022.pdf
    • https://cdn.shopify.com/s/files/1/0436/3301/6982/files/24389367423.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/57896919986.pdf
    • https://cdn.shopify.com/s/files/1/0436/8472/4889/files/lukapubitogesowem.pdf
    • https://cdn.shopify.com/s/files/1/0430/4742/0066/files/35590546968.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51686393220.pdf
    • https://cdn.shopify.com/s/files/1/0431/6620/4066/files/raxuwekiz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077ae.bin
2f8251d0ead2e245e94f66f5a4fd5cf5179317916f3bf8c2880a16c79daeb2c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77AE 8968 bytes
font_01_sfnt_off000095e2.bin
29107b9e18a041294d1c61f893b6fbb39826456dac050ac7e0800f2a16c7fe51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95E2 5048 bytes
font_02_sfnt_off0000a6dd.bin
2a51dd787552c0ffa2404509c2222dfe2a1532c7aa08226750cdbe467b9af6bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6DD 10112 bytes
font_03_sfnt_off0000c96b.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC96B 4324 bytes

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