Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea714fe2196e037…

MALICIOUS

PDF

43.3 KB Created: 2020-08-11 20:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f48e9d3750574f64dcc8a3601135908 SHA-1: 24192a154deec45b992bf36d6909ced858745619 SHA-256: 8ea714fe2196e0374536dd96a0b58c505843b14621a532b39f78343ee228f3de
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=application+of+probability+in+computer+science+pdf', is designed to redirect users to potentially harmful content. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to distribute malicious files. The ML classifier also 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=application+of+probability+in+computer+science+pdf
    • http://witev.orderfreshmed.com/uploads/1/3/1/4/131482975/jasewolezofiz-paruzowov.pdf
    • http://files.kenairiverfoundation.org/uploads/1/3/1/8/131871902/0fa40f.pdf
    • http://luwavazu.vandaliachurchofgod.org/uploads/1/3/0/7/130738970/1c76b.pdf
    • http://files.incaenterprises.org/uploads/1/3/1/3/131380916/rukev.pdf
    • https://cdn.shopify.com/s/files/1/0438/4695/9261/files/hearty_durian_botw.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6656/files/56976972495.pdf
    • https://cdn.shopify.com/s/files/1/0433/4832/8603/files/63215707075.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/35209966956.pdf
    • https://cdn.shopify.com/s/files/1/0438/5924/7264/files/vimirojatinosunifukan.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/pogajolo.pdf
    • https://cdn.shopify.com/s/files/1/0436/1073/4755/files/99535814203.pdf
    • https://cdn.shopify.com/s/files/1/0440/0755/5222/files/lanipe.pdf
    • https://cdn.shopify.com/s/files/1/0434/7697/5768/files/73597864051.pdf
    • https://cdn.shopify.com/s/files/1/0431/9494/1603/files/vunexuwomerub.pdf
    • https://cdn.shopify.com/s/files/1/0427/9717/0847/files/dovapogusolawafusuzixezi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3028/1381/files/riesgo_cardiovascular_aha.pdf
    • https://cdn.shopify.com/s/files/1/0431/8763/4338/files/fekofixenujubozivepuvovol.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_off00006a87.bin
9e054d86ff36ef927740b020e6b4e94cea1db3253ef608d45cda84ac09398d5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A87 5532 bytes
font_01_sfnt_off00007d32.bin
e519df22e0bb405afd4ecea242bcb7964da5cdefa672ce7a37c02ba91ac6b3fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D32 10032 bytes

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