Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d309797c96570f…

MALICIOUS

PDF

46.4 KB Created: 2020-08-15 16:39:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7041e1d34ee4072247d5fa4792cb351 SHA-1: 9222ff99265d54e054d33b019fbdbddae57702d7 SHA-256: 74d309797c96570fb1f7f421465214a1e2be5c547d8092eabc3fa47908b63d2b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern observed is the creation of a link farm designed to lure users to potentially harmful websites, likely for phishing or malware distribution.

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=el+aguijon+de+pablo+pdf
    • http://files.georgevecsey.com/uploads/1/3/1/0/131071043/xibelipubur.pdf
    • http://files.pressnellcreative.com/uploads/1/3/1/4/131407742/3b079871b9c1c.pdf
    • http://files.ctnonline.com/uploads/1/3/2/7/132740845/8933022.pdf
    • http://files.hotdoghols.co.uk/uploads/1/3/1/6/131637043/707450.pdf
    • http://files.animationstationpodcast.com/uploads/1/3/1/4/131483138/6c979.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/5324/3816/files/tch_file_sang_nh.pdf
    • https://cdn.shopify.com/s/files/1/0429/8450/5498/files/articles_grammar_examples.pdf
    • https://cdn.shopify.com/s/files/1/0429/1582/3772/files/89517866674.pdf
    • https://cdn.shopify.com/s/files/1/0429/5789/7882/files/38372942827.pdf
    • https://cdn.shopify.com/s/files/1/0435/6970/9217/files/bubble_letters_alphabet.pdf
    • https://cdn.shopify.com/s/files/1/0434/1848/4888/files/elementary_course_bascom_avr.pdf
    • https://cdn.shopify.com/s/files/1/0430/5531/7149/files/64766575103.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/zusaronegufu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9375/2997/files/3464959494.pdf
    • https://cdn.shopify.com/s/files/1/0437/2057/3082/files/campbell_biology_9th_edition_dropbox.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_off000069bb.bin
d655a3f5027aed7f40a142bfeb5b1ba37ac6188c1a44b8ab5def3c573627c9c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69BB 4912 bytes
font_01_sfnt_off00007a79.bin
c13bba23d5dbb57cff70b9f87fdc457fd8134dbaf6cbdd7ff95a58fec44ceb3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A79 11180 bytes
font_02_sfnt_off00009ee2.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EE2 4324 bytes

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