Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f7a50dfbb8c44a…

MALICIOUS

PDF

54.1 KB Created: 2020-08-23 02:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1613be658330fdf690a9a7d6c673402 SHA-1: f3673b14ee81e4e87e0eea1248f5c628c64cbb2f SHA-256: a8f7a50dfbb8c44aaba6a95a5370e8e4ecdb8f34ae5a18d0bf92a1bf6320e9f9
150 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector to a malicious URL, indicating a phishing or scam attempt. The document body, though obfuscated, contains the text "Knuckle sandwich meme template" and the malicious URL, suggesting a lure to entice users to click the link. The presence of numerous external PDF links further supports the SEO link farm heuristic, likely used to obscure the malicious redirector.

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=knuckle+sandwich+meme+template
    • http://zujiri.everydaywithautism.com/uploads/1/3/2/8/132816066/2806612.pdf
    • http://files.methodistfiji.org/uploads/1/3/2/6/132681304/f73e29e8.pdf
    • http://files.boshamretreats.co.uk/uploads/1/3/1/4/131407152/wozinewefokiji.pdf
    • http://xupareti.gowanuswines.com/uploads/1/3/1/4/131453540/sufazesoge_dufemujemesares.pdf
    • http://files.redclayphotography.org/uploads/1/3/1/4/131409135/mufajiti.pdf
    • https://cdn.shopify.com/s/files/1/0435/5316/1367/files/9907827168.pdf
    • https://cdn.shopify.com/s/files/1/0445/8522/2308/files/fortin_barometer.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4070/files/51581633960.pdf
    • https://cdn.shopify.com/s/files/1/0440/4301/0213/files/advantages_and_disadvantages_of_free_trade_agreements.pdf
    • https://cdn.shopify.com/s/files/1/0437/7162/5621/files/best_swing_trading_strategies.pdf
    • https://cdn.shopify.com/s/files/1/0428/8764/3303/files/base_form_simple_past_past_participle_list.pdf
    • https://cdn.shopify.com/s/files/1/0428/7086/6076/files/hashimoto_s_thyroiditis_diet.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_off000057e4.bin
e48e0338b5a9a3ce2b81d8282ba9c90ba8fed5ebda87fc1a0174afd02fca4b4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57E4 5116 bytes
font_01_sfnt_off00006924.bin
7f91c209a452b3132f41dea468de761fc54dc4ac90b896ccfa6f4999dd260e94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6924 6072 bytes
font_02_sfnt_off00007e19.bin
6c5f822e5c69aba2c9ce47feafee49b9bca0ba64fe8ed2105d8ba0079a7b48c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E19 11420 bytes
font_03_sfnt_off0000a534.bin
06917d6b41892aabe41fe885689791173f32f8b1c592788fb3df802de3ee6237		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA534 16980 bytes
font_04_sfnt_off0000bcf8.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF8 4324 bytes

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