Malicious PDF — malware analysis report

Static analysis result for SHA-256 21bfb2b53fa124f6…

MALICIOUS

PDF

58.9 KB Created: 2020-08-29 00:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c8111e646da65184f6b22f8297abb61 SHA-1: b0a2ae8bb6264598d26a04a7dc1634ad64fd53b2 SHA-256: 21bfb2b53fa124f6d15f97a5a3c7ed3dd70e05bd73ed099f27f1857d7964bc97
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a link to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous links, including one pointing to 'ttraff.cc', suggests a phishing or malicious content delivery attempt.

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/wix?keyword=%25D8%25A7%25D9%2584%25D8%25AC%25D9%2586%25D8%25B3+%25D8%25A7%25D9%2584%25D8%25A5%25D8%25A8%25D8%25A7%25D8%25AD%25D9%258A+%25D8%25A7%25D9%2584%25D8%25A3%25D9%2588%25D8%25B1%25D9%2588%25D8%25A8%25D9%258A
    • https://static.usrfiles.com/ugd/b8c837_1f625cbcf4794ec5883a050d4165a7bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7fb09465e844f60a5f78eeb576c7fdd.pdf
    • https://static.usrfiles.com/ugd/b8c837_411da9f96bd64d42b5d9faf7ff2e1b4c.pdf
    • https://cdn.shopify.com/s/files/1/0428/2171/4079/files/35164321448.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7291/files/yaesu_ft-_757gx.pdf
    • https://cdn.shopify.com/s/files/1/0428/5677/5839/files/jemesofixeja.pdf
    • https://cdn.shopify.com/s/files/1/0444/1748/2919/files/lulota.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/98440474618.pdf
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/technical_service_manager_resume.pdf
    • https://cdn.shopify.com/s/files/1/0429/3469/8147/files/72886511020.pdf
    • https://cdn.shopify.com/s/files/1/0428/1060/5735/files/bemilawod.pdf
    • https://cdn.shopify.com/s/files/1/0433/9220/4950/files/2436923830.pdf
    • https://cdn.shopify.com/s/files/1/0432/5346/5243/files/securecrt_7_portable.pdf
    • https://cdn.shopify.com/s/files/1/0437/4501/8017/files/94356010391.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
stream_006_off0000a874.bin
7b4e8e0ca20887aec1e48dae392153a768ada4f0576c725afbfcebae059e8505		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA874 29168 bytes
font_00_sfnt_off000059f3.bin
3e900196e372575ee1af689ac1189ef6d8c737e738b089e874f4efaa939d80c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59F3 4068 bytes
font_01_sfnt_off000067cf.bin
a6d38cab43d23fd71964caa06303beada6ce6c6444e31ddb7ec7fa1f7f47df1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67CF 17636 bytes
font_02_sfnt_off00008207.bin
6417e4394fb229b7a6548379b296b4820e8f74840a182f8fe984f276b575e326		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8207 12016 bytes

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