Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa51ef98d981c1e…

MALICIOUS

PDF

48.4 KB Created: 2020-08-03 05:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cb6db761ef271f1eacb8348fad2499a SHA-1: 3236d0169b764e1cd1319c31a9fab4594059e547 SHA-256: 7fa51ef98d981c1ecdea33a4e8c6bbaf429ead0517680607ef4f730fe341d014
150 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a link farm of 26 external PDF links. One of these links, 'https://ttraff.cc/pify?keyword=wrong+fs+type+bad+option+bad+superblock', points to a known malicious redirector. The document body contains garbled text but includes the redirector URL and several other PDF URLs, suggesting a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=wrong+fs+type+bad+option+bad+superblock
    • http://files.fiddleheadcellars.com/uploads/1/3/0/9/130969083/92e3c551e.pdf
    • http://files.nicolemillersandiego.com/uploads/1/3/2/6/132695329/4306227.pdf
    • http://files.mbmulhall.com/uploads/1/3/1/6/131636677/sikosorigoj.pdf
    • http://files.sheilabanks.com/uploads/1/3/1/8/131856200/9963369.pdf
    • https://cdn.shopify.com/s/files/1/0428/2076/3804/files/rewan.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3971/files/murarakaxezogixa.pdf
    • https://cdn.shopify.com/s/files/1/0432/9344/2208/files/ridogifesofolexosokujix.pdf
    • https://cdn.shopify.com/s/files/1/0427/8353/9366/files/xududatewejesuzekex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9472/1187/files/90393136569.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lojuxefututa.pdf
    • https://cdn.shopify.com/s/files/1/0432/9570/3204/files/free_light_o_rama_sequences.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5352/files/charly_garcia_discografia_flac.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/sierra_reloading_data.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006303.bin
141de751887a2b0e98847e412435ae7c5865d53c22640458ca3e3ea2365deddc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6303 5524 bytes
font_01_sfnt_off000075e5.bin
66bb7e2405fee3d36868faa77b597ffd195547ee8e84046889899db2c500f4c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75E5 15472 bytes
font_02_sfnt_off0000a69e.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA69E 4324 bytes

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