Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bbcabb573b83529…

MALICIOUS

PDF

40.5 KB Created: 2020-08-05 09:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 112d2887894ecf39f7bb860757d09273 SHA-1: 7c3e159dfef57681a71cb528fc32c71477230798 SHA-256: 3bbcabb573b8352989437bcc3eeaf947dee2f085469513afea4ad804b34bdf03
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at ttraff.cc. The document body, though heavily obfuscated, contains the same lure text and URLs as the heuristic findings, indicating a social engineering attempt to direct users to malicious content. The ML classifier strongly supports the malicious verdict.

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.cc/pify?keyword=digital+painting+in+photoshop+industry+techniques+for+beginners+pdf
    • http://files.studio-acm.com/uploads/1/3/0/9/130969659/3221970.pdf
    • http://files.allaboutthemouse.com/uploads/1/3/0/8/130874633/1252736.pdf
    • http://files.katherinemarieprice.com/uploads/1/3/0/7/130776296/3140051.pdf
    • http://files.statementculture.com/uploads/1/3/1/1/131164273/woxumevex_jorekosilif.pdf
    • https://cdn.shopify.com/s/files/1/0433/4374/1083/files/15804102785.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/lipufimodivadetolarag.pdf
    • https://cdn.shopify.com/s/files/1/0434/5099/0753/files/2815522177.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vixegenosevisime.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4182/files/gusisugag.pdf
    • https://cdn.shopify.com/s/files/1/0438/1461/7250/files/engineering_mechanics_statics_14th_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0432/5706/9721/files/jotugavagofune.pdf
    • https://cdn.shopify.com/s/files/1/0436/4402/7038/files/wow_classic_sharp_claw.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9877/files/witedimidenafug.pdf
    • https://cdn.shopify.com/s/files/1/0427/7927/9527/files/wefetajil.pdf
    • https://cdn.shopify.com/s/files/1/0433/3223/9528/files/82002894283.pdf
    • https://cdn.shopify.com/s/files/1/0430/6137/9226/files/fitadutatajewoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4027/6642/files/2566267504.pdf
    • https://cdn.shopify.com/s/files/1/0434/7192/9496/files/2400521947.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e0c.bin
38971af14e4215feac9f058926fafbc44e5a60faad9bf731a5bc202ca1da9071		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0C 5784 bytes
font_01_sfnt_off000071c1.bin
bb8bc6fec1d4087091a48444c478c03dde416b2280743e92bd1240a2537c4b16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C1 10088 bytes

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