Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9f06a093a9faea…

MALICIOUS

PDF

42.5 KB Created: 2020-09-05 11:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 016aef8fd459b2481e49f846f4b8780b SHA-1: 001027f56cfd1fa24d077efd87748a3c457221c8 SHA-256: aa9f06a093a9faea5a546612a092fa9882ed4c71319dcd68a0a0f18bee4aeade
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=mt8870+dtmf+decoder+datasheet'. This URL is the primary indicator of malicious intent. The document body, though heavily obfuscated, contains references to the datasheet and the malicious URL, reinforcing the lure. The PDF also contains a large number of external links, many pointing to benign Shopify domains, suggesting a link farm or SEO poisoning attempt to mask 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/wix?keyword=mt8870+dtmf+decoder+datasheet
    • https://static.usrfiles.com/ugd/76dd3d_6df1af7f849c4413a3adb57a0b54d15b.pdf
    • https://static.usrfiles.com/ugd/07625c_37d41b0a5c1048cb9fc9435447cb27b9.pdf
    • https://static.usrfiles.com/ugd/6924eb_e7367fefe15b47f9addc18c08ff4fb3b.pdf
    • https://cdn.shopify.com/s/files/1/0440/8272/5029/files/before_i_let_go_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/7492/9319/files/roruw.pdf
    • https://cdn.shopify.com/s/files/1/0430/8212/1377/files/74095735360.pdf
    • https://cdn.shopify.com/s/files/1/0462/7126/6973/files/42977309867.pdf
    • https://static.usrfiles.com/ugd/d4da64_b6987ec085da4989afaa3633066e028d.pdf
    • https://static.usrfiles.com/ugd/fedf23_759b63a00cb940419fc3bc8eddf8ace4.pdf
    • https://static.usrfiles.com/ugd/824332_aec0093b67d44156b1e6477f308774e3.pdf
    • https://cdn.shopify.com/s/files/1/0441/4291/9832/files/90749199094.pdf
    • https://cdn.shopify.com/s/files/1/0436/0772/0094/files/presion_manometrica_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0316/files/44644468037.pdf
    • https://cdn.shopify.com/s/files/1/0428/3233/0908/files/12382594062.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_off00006582.bin
e7e3ce5b77bba192dee99c7af8018621892e03c7d435d7a1c21733f08e4768c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6582 5648 bytes
font_01_sfnt_off000078a5.bin
73c3e2a2c775af4f77909a1ca0b642489913455c506db33e8950556ec83aed3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A5 10908 bytes

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