Malicious PDF — malware analysis report

Static analysis result for SHA-256 15cbb95fa8d188cb…

MALICIOUS

PDF

44.5 KB Created: 2020-08-10 21:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d71dc55e957e878641b95ca41e43c8a SHA-1: 31a0ef94dddfee801aa876f3b45c8c5975006b82 SHA-256: 15cbb95fa8d188cb5805ddc8f395b6b4966dca7aaa55d13146a8cebed854f3df
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=libro+beber+agua+de+mar+pdf'. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and appears to contain the same URLs.

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=libro+beber+agua+de+mar+pdf
    • http://files.caywoodhandbook.com/uploads/1/3/0/7/130740571/digivi-laxob.pdf
    • http://sageledo.honoroneself.com/uploads/1/3/2/7/132740541/5184942.pdf
    • http://wanox.usaboxingmetro.com/uploads/1/3/0/8/130813528/4d045a0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/0588/5090/files/19692877123.pdf
    • https://cdn.shopify.com/s/files/1/0441/4255/9384/files/atlas_lathe_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/3013/4427/files/zipemoneruvedibega.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/fanaxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8903/4402/files/12758686438.pdf
    • https://cdn.shopify.com/s/files/1/0434/3499/9975/files/gopigenubopi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6899/7283/files/52068527952.pdf
    • https://cdn.shopify.com/s/files/1/0430/7274/9721/files/92589786636.pdf
    • https://cdn.shopify.com/s/files/1/0432/2403/9592/files/gatoxumaduwuviluxudabamum.pdf
    • https://cdn.shopify.com/s/files/1/0432/0739/3439/files/kukeronirusizus.pdf
    • https://cdn.shopify.com/s/files/1/0433/5891/2662/files/amazing_grace_picture_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/9886/4804/files/chuyen_doi_sang_jpg_online.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8752/files/palmistry_in_bengali.pdf
    • https://cdn.shopify.com/s/files/1/0431/0240/4769/files/85915055369.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006139.bin
d92963bfdc5ebf7ceb0dfae29677eb113dfb0dde67fad9073c1c25e79640eaa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6139 4928 bytes
font_01_sfnt_off000071f4.bin
8d3004964ff5a6b243cd0de7a641fc6a02d6225536bd7fb2309690547856f50c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71F4 11364 bytes
font_02_sfnt_off00009709.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9709 4324 bytes

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