Malicious PDF — malware analysis report

Static analysis result for SHA-256 de82b75a410b48fc…

MALICIOUS

PDF

46.9 KB Created: 2020-08-28 04:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccec563d1b31013b14e42348981a448a SHA-1: 25b4164019c79b1aadf010fb960a77383ec78f1b SHA-256: de82b75a410b48fc1a63301baceca3e7b724d2699365d3cfb0df7ea42fc7d8bf
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors, indicating a phishing or malicious redirection attempt. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=scale+factor+worksheets, which is identified as a malicious redirector.

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=scale+factor+worksheets
    • http://rovob.tomcampbellfitness.com/uploads/1/3/0/8/130814328/tilufiv_desufoj.pdf
    • http://files.artbystein.com/uploads/1/3/0/7/130739443/3754186.pdf
    • http://jopora.redriverthunder.com/uploads/1/3/1/4/131406925/watifixi_nidot_bigofet.pdf
    • http://files.the-osg.org/uploads/1/3/1/4/131437308/mavunubusanezufi.pdf
    • http://files.amandaghahremani.com/uploads/1/3/1/4/131438111/2306855.pdf
    • https://cdn.shopify.com/s/files/1/0433/5081/8981/files/75023155519.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9463/files/xavojopadikotamijaraf.pdf
    • https://cdn.shopify.com/s/files/1/0431/3248/5799/files/46504974326.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8360/files/gokibuzejodixabatame.pdf
    • https://cdn.shopify.com/s/files/1/0433/6350/0197/files/zefexas.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/jabuwun.pdf
    • https://cdn.shopify.com/s/files/1/0432/4940/2016/files/71871431529.pdf
    • https://cdn.shopify.com/s/files/1/0440/7659/7400/files/jitisesuweduv.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/15461294817.pdf
    • https://cdn.shopify.com/s/files/1/0430/3699/9842/files/sotumirakav.pdf
    • https://cdn.shopify.com/s/files/1/0435/2330/9727/files/drown_bring_me_the_horizon_lyrics.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_off00006c3d.bin
32bc2fc76a8e261d63a49c13c48b31bca5fe18af41151c2182e49a4a2ec70fd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C3D 4860 bytes
font_01_sfnt_off00007cd7.bin
66f8a022df45ecb18448894a86386009742b64b1d1f66ff01dfb13ca594e2fb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD7 10636 bytes
font_02_sfnt_off0000a0fc.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0FC 4324 bytes

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