Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d14477e4e9bc2d…

MALICIOUS

PDF

47.2 KB Created: 2020-08-24 06:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79adb38f4cd85c44c4fec284789ab05f SHA-1: 34d022f49930367bb810e293d85f582b938bb480 SHA-256: 11d14477e4e9bc2db64452b4aa8ec53229a6a37f7592aaa51a793a66b6096a6a
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 document body, though heavily obfuscated, contains a URL that matches the redirector found in the heuristics, suggesting an attempt to lure users to malicious sites.

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=avarice+in+adjective+form
    • http://mulutoxe.latorreholidays.com/uploads/1/3/1/1/131164132/bijuvepe_ripixijufuniso_zegasu.pdf
    • http://files.cloud9science.net/uploads/1/3/2/6/132682124/b67c7bb9e3.pdf
    • http://surisat.michellelewisphotography.com/uploads/1/3/1/4/131438110/revivudidenoz_kuzuzefejaluso.pdf
    • http://files.switchbricks.com/uploads/1/3/2/6/132695430/9117a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/1806/7866/files/mufutaloxurirovadidomus.pdf
    • https://cdn.shopify.com/s/files/1/0430/2218/8701/files/baldesion_arsenal_ozma_guide.pdf
    • https://cdn.shopify.com/s/files/1/0427/9851/4343/files/20650194755.pdf
    • https://cdn.shopify.com/s/files/1/0432/6424/5925/files/4888754933.pdf
    • https://cdn.shopify.com/s/files/1/0441/1247/8360/files/xirafilozusowasapulupo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1357/0709/files/nirapubugimovalugiz.pdf
    • https://cdn.shopify.com/s/files/1/0436/5657/7182/files/77860790639.pdf
    • https://cdn.shopify.com/s/files/1/0434/9224/5666/files/problem_and_solution_worksheets_4th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0434/7458/3702/files/48942009548.pdf
    • https://cdn.shopify.com/s/files/1/0434/9424/4516/files/tupujevewuvibakisix.pdf
    • https://cdn.shopify.com/s/files/1/0438/4676/2656/files/8464139022.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/kemili.pdf
    • https://cdn.shopify.com/s/files/1/0430/1701/1353/files/gigemap.pdf
    • https://cdn.shopify.com/s/files/1/0431/2596/4949/files/gikanoramufabuso.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_off00006b3c.bin
e6b462d110ae74fa711c2c088337f261c814473d0267168b7dfa1bcf4895e1b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3C 4872 bytes
font_01_sfnt_off00007baf.bin
66d99333c990cae6fee5177b1ccca9e62234b72e4b5f507ff6ffe9545aebacc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BAF 11104 bytes
font_02_sfnt_off0000a1a7.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1A7 4324 bytes

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