Malicious PDF — malware analysis report

Static analysis result for SHA-256 20511e9245dce1d7…

MALICIOUS

PDF

41.9 KB Created: 2020-08-13 23:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc1c29809e7929af67ef7aff29a47a05 SHA-1: 420b6791a76d0855a4bb59ecb7f34ebe6377dbff SHA-256: 20511e9245dce1d7436aceff9eb9b17388a87a75381e8ce74b1b446c4d96c0ef
152 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains a URL that appears to be part of a lure. The presence of a large number of external PDF links, as indicated by 'PDF_SEO_LINK_FARM', suggests an attempt to distribute malicious content or engage in SEO abuse. The primary malicious URL identified is https://ttraff.com/pify?keyword=shakira+songs++mp4.

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.com/pify?keyword=shakira+songs++mp4
    • http://files.chefmaggiesfoodfest.com/uploads/1/3/1/6/131606630/suniboluri.pdf
    • http://didefafeb.msdooleysscienceclass.com/uploads/1/3/1/1/131164250/bexojoj_josuzulewoto.pdf
    • http://wukitije.lehman-guns-research.org/uploads/1/3/1/6/131606490/6999066.pdf
    • http://binufu.eyereeimages.com/uploads/1/3/1/3/131379678/rosekuxip-zozepuromujev-wosas.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/kexugosejubuwinog.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49726552648.pdf
    • https://cdn.shopify.com/s/files/1/0432/1614/2497/files/fremenik_trials_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/kanefav.pdf
    • https://cdn.shopify.com/s/files/1/0433/0097/8853/files/bufan.pdf
    • https://cdn.shopify.com/s/files/1/0436/9324/4570/files/bibolubito.pdf
    • https://cdn.shopify.com/s/files/1/0436/4114/3454/files/monster_manual_v.pdf
    • https://cdn.shopify.com/s/files/1/0433/9341/7366/files/26237059326.pdf
    • https://cdn.shopify.com/s/files/1/0438/9008/1960/files/97720070951.pdf
    • https://cdn.shopify.com/s/files/1/0429/2742/3654/files/20470095137.pdf
    • https://cdn.shopify.com/s/files/1/0432/2276/1635/files/kikagonomupiduj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000458c.bin
2cc621e0215746addf4a0732a0bfb1b9cb9b072bb9e6be280e40c8bff5727ec4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x458C 5456 bytes
font_01_sfnt_off000057ee.bin
9db369e79cd7c072d0bf0236802ca9ac03ff91427679ecd63f6e1f262ca9e772		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57EE 10228 bytes
font_02_sfnt_off00007b33.bin
a94171d0a983f35748cc3da89988e51b0ee8d70713ed373ecb0f086e991a4872		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B33 18900 bytes

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