Malicious PDF — malware analysis report

Static analysis result for SHA-256 6abcfbc4f4d11b33…

MALICIOUS

PDF

51.8 KB Created: 2020-08-15 20:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f84b0da02439aa3af7a3a9ff32bdf13e SHA-1: 8d1ecb3a87e8ef9bbe5f96b59cd8ec7d8ff4d376 SHA-256: 6abcfbc4f4d11b339145109807d056b674eea28a24838dfddc6bd99b2cc85a04
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The document body, though heavily obfuscated, contains text related to antivirus software and a URL that appears to be a lure. The presence of numerous links suggests an attempt to direct users to potentially harmful websites, possibly for SEO manipulation or to serve malicious content.

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=antivirus+free+virus+cleaner+security+apk
    • http://files.iasocdev.com/uploads/1/3/2/6/132683111/zifawogez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0452/4271/2221/files/professional_capabilities_framework_for_social_workers.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9635/files/english_for_aviation_practice_test_2.pdf
    • https://cdn.shopify.com/s/files/1/0428/2744/8476/files/jutapanejalum.pdf
    • https://cdn.shopify.com/s/files/1/0437/6081/2190/files/16933505432.pdf
    • https://cdn.shopify.com/s/files/1/0431/8402/9854/files/89326724386.pdf
    • https://cdn.shopify.com/s/files/1/0429/0114/3715/files/nipaziguf.pdf
    • https://cdn.shopify.com/s/files/1/0438/3247/5798/files/worthy_is_the_lamb_chords.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wajomuxufukurojudi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4027/6642/files/tuvewamunedivege.pdf
    • https://cdn.shopify.com/s/files/1/0434/6046/0706/files/12160498806.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60801944673.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ac5.bin
b099e9b33f5808ea83b3e865125644ac9f3219651db39d8e8d4785e7439f8e47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC5 5224 bytes
font_01_sfnt_off00006ca0.bin
0bc98fb50639d075a62265af6852ced6a448827b2e7c27192138610b39f7bd19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA0 7244 bytes
font_02_sfnt_off0000860f.bin
387689a0362b9aafae1075360c5137c21234967ba517c85a25f49046a1ef3147		 pdf-font-stream PDF embedded font (sfnt) at offset 0x860F 10664 bytes
font_03_sfnt_off0000aac5.bin
b743e1c7f4c3fb4dc50e5a98d0858820076cb9d41d53abb10cae9ffc7bcebf1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAC5 16184 bytes

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