Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c9ef5916e4ac55…

MALICIOUS

PDF

42.4 KB Created: 2020-08-18 16:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fa1e181c70b199f2073bdef62dbfb40 SHA-1: 4cec2c921a3afe333d6b6643ff273ef7801a031f SHA-256: 12c9ef5916e4ac552e53c70a864af9f5a3ee19b28264c35de8a613db055b8029
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, also contains URLs that appear to be part of a link farm strategy. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed for malicious redirection or SEO manipulation.

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=apexification+procedure+pdf
    • http://natenax.downtheroadwellness.com/uploads/1/3/1/3/131380345/7045232.pdf
    • http://fabavugi.holeintherockministries.org/uploads/1/3/1/3/131398140/sutosu_wajokeza.pdf
    • http://maner.jordanemmons.com/uploads/1/3/0/8/130813372/menol-rudevevakoref-wumuraf-paxebonama.pdf
    • http://jozixuna.corpsaccess.org/uploads/1/3/0/7/130776031/pasefiveferibelusa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7846/7222/files/53315379880.pdf
    • https://cdn.shopify.com/s/files/1/0434/0963/7530/files/4125714779.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/57671111188.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/severinekajifenogulukak.pdf
    • https://cdn.shopify.com/s/files/1/0440/0644/1125/files/digital_potentiometer_arduino.pdf
    • https://cdn.shopify.com/s/files/1/0432/1355/3827/files/how_to_calculate_ac_5e.pdf
    • https://cdn.shopify.com/s/files/1/0439/9867/5102/files/astrophysical_jets.pdf
    • https://cdn.shopify.com/s/files/1/0433/5563/5880/files/ttw_mods_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/5654/5433/files/nexojawugopupifejem.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/79068904027.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7189/files/aleph_borges_ita.pdf
    • https://cdn.shopify.com/s/files/1/0433/1739/5611/files/7699853036.pdf
    • https://cdn.shopify.com/s/files/1/0431/4211/9592/files/93777921508.pdf
    • https://cdn.shopify.com/s/files/1/0434/1838/6588/files/git_check_origin.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067fe.bin
484a304684cacb7825f26235fcb2ad7217e40b8c3cb70da08e2ead748abf21ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67FE 4996 bytes
font_01_sfnt_off00007903.bin
31dd5a13f81b8d3463ad7492b41d95655d5e36568dc3e391867a1953eca190d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7903 10324 bytes

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