Malicious PDF — malware analysis report

Static analysis result for SHA-256 8839e3a5a7f537e5…

MALICIOUS

PDF

44.2 KB Created: 2020-08-21 02:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf1c804879b6205adbe0dd4c1e07fff5 SHA-1: ad961c128d40d00ffd059475c6d00b301045fded SHA-256: 8839e3a5a7f537e50e0bf1a33b4281e07053928c86e6a0dc47052ce8720cbdfa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a link farm hosted on Shopify. One of these links redirects to a known malicious infrastructure at 'ttraff.ru'. The document body, though partially corrupted, contains the same URL, suggesting an attempt to disguise malicious activity under a seemingly innocuous topic like a camera manual. The ML classifier 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.ru/pify?keyword=sony+camera+a5000+manual
    • http://files.tohsthecenter.org/uploads/1/3/1/3/131379923/7845369.pdf
    • http://files.nestbpt.com/uploads/1/3/0/8/130874161/d5f78f2e.pdf
    • http://jebejun.therobertabadydogfoodcoltd.com/uploads/1/3/0/7/130776485/e401c0459.pdf
    • http://nepix.alazhartemple195.org/uploads/1/3/2/6/132681670/6798690.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1829/7245/files/absolute_phrase_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/5937/2439/files/factorial_in_python.pdf
    • https://cdn.shopify.com/s/files/1/0429/5832/3865/files/nobijimabukumo.pdf
    • https://cdn.shopify.com/s/files/1/0438/7084/7131/files/xapelolawotikemejo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4447/files/utorrent_free_movies_online.pdf
    • https://cdn.shopify.com/s/files/1/0435/6653/0719/files/lewopomoworupeba.pdf
    • https://cdn.shopify.com/s/files/1/0431/2553/8980/files/35540081496.pdf
    • https://cdn.shopify.com/s/files/1/0431/0325/6737/files/catalizadores_en_quimica_organica.pdf
    • https://cdn.shopify.com/s/files/1/0433/3885/8650/files/78445006642.pdf
    • https://cdn.shopify.com/s/files/1/0432/9432/6949/files/laresos.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_off000054d2.bin
7abee62b52f2f5c79443d0e7cb432644f7437fbc466beaf7cc6d102eff3a4b64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54D2 3776 bytes
font_01_sfnt_off00006261.bin
561beae39a630c2086230ec4d4fa7bc9a9f1b6563b3b31759dddbc4872f296c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6261 5240 bytes
font_02_sfnt_off00007418.bin
7b2c359e7b96d450d506122c103de56b2603d6bde95b53b4ab8da5a031173c15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7418 15632 bytes

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