Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc116d540921c32…

MALICIOUS

PDF

59.7 KB Created: 2020-08-11 01:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0edb9c7697f63991fce9f873ca55f53 SHA-1: 0e1341d7aca1c591001bf510c30f1d277b255b07 SHA-256: bcc116d540921c327abf55fd7f9007eb1f25746c86ab819dd1a2d9512448176b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. This suggests a link farm designed to obscure the ultimate malicious destination. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious redirector URL is the primary indicator of compromise.

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+cerebrito+pdf
    • http://pofabal.rqgenesis.co/uploads/1/3/1/4/131408899/83bb45a100.pdf
    • http://gameged.shanitclark.com/uploads/1/3/1/1/131163635/5210215.pdf
    • http://files.artistreecavaliers.com/uploads/1/3/0/7/130775362/45fdb25ba4.pdf
    • https://cdn.shopify.com/s/files/1/0437/0530/3205/files/zakibimejuwikalowemon.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/hydro_pneumatic_braking_system.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7831/files/pumamapajakirixorevob.pdf
    • https://cdn.shopify.com/s/files/1/0429/1543/0553/files/44245516043.pdf
    • https://cdn.shopify.com/s/files/1/0435/4041/4615/files/newadezebav.pdf
    • https://cdn.shopify.com/s/files/1/0427/5778/3718/files/36607709797.pdf
    • https://cdn.shopify.com/s/files/1/0429/5720/9766/files/71243638017.pdf
    • https://cdn.shopify.com/s/files/1/0429/3984/2719/files/probability_sample_space.pdf
    • https://cdn.shopify.com/s/files/1/0432/3626/2052/files/1._5_times_4.pdf
    • https://cdn.shopify.com/s/files/1/0431/2960/2205/files/petavemutav.pdf
    • https://cdn.shopify.com/s/files/1/0434/3581/9173/files/palulobeten.pdf
    • https://cdn.shopify.com/s/files/1/0444/5909/8279/files/maths_addition_worksheets_for_grade_1.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ab8.bin
127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB8 6744 bytes
font_01_sfnt_off00007b9f.bin
ee9981ff9814bb6268a8bff5faa47c273d2aa6607c0327624fe2f7e2d10b10f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B9F 4540 bytes
font_02_sfnt_off00008b07.bin
c4ebf9374f183e0d06abff076368f9778f5420368af1f3cb29c6cd45b472c97f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B07 1892 bytes
font_03_sfnt_off00009427.bin
0cbbd492441ab16be5827cb287f267856f6d09143c4ea81ae8f5c9e2745abf99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9427 12124 bytes
font_04_sfnt_off0000bbd6.bin
c3d0ee408bee49a88931d2ac630a9fb52e88a46fabab5a72aa19e78bbe1d3826		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD6 16376 bytes
font_05_sfnt_off0000d17e.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD17E 4324 bytes

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