Malicious PDF — malware analysis report

Static analysis result for SHA-256 681bc07998ce0b6c…

MALICIOUS

PDF

63.9 KB Created: 2020-08-30 18:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3de5e441ae9ed3c6bd18065227df83fa SHA-1: b137fe35f283a308b022153c2a528f9a10effc88 SHA-256: 681bc07998ce0b6cb2d5087609a3b82113bc26506f151ddb69d20d6628c203fe
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is flagged as malicious. The document body, though heavily obfuscated, contains text related to 'dts sound app for android' and the malicious URL, suggesting a lure to a potentially harmful site. The presence of numerous external links, many pointing to benign Shopify-hosted PDFs, indicates a link farm strategy, likely to improve SEO for malicious content or to obscure the true destination.

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/wix?keyword=dts+sound+app++for+android
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_ca084c4f7b0541d7baabb864e8fe120d.pdf
    • https://static.usrfiles.com/ugd/12745a_019b2f07a24945d6b9a8bb859b38cb89.pdf
    • https://static.usrfiles.com/ugd/e4a001_eccf2ed67c284402af331869d5112a11.pdf
    • https://cdn.shopify.com/s/files/1/0435/8583/1080/files/6064147599.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/vovid.pdf
    • https://cdn.shopify.com/s/files/1/0439/0033/8331/files/telaxozuno.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/figiniweganegotab.pdf
    • https://cdn.shopify.com/s/files/1/0441/2728/9496/files/ashrae_heat_load_calculation_spreadsheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/daragigawi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2065/6545/files/vipalubumukag.pdf
    • https://cdn.shopify.com/s/files/1/0472/3166/4293/files/limitless_admin_template_nulled.pdf
    • https://cdn.shopify.com/s/files/1/0428/1407/9143/files/kafofotutatetoju.pdf
    • https://static.usrfiles.com/ugd/b8c837_cbafac0e7d174d3388260a72d41f770f.pdf
    • https://static.usrfiles.com/ugd/fe83c3_0152cf0256364e7890e73d0d4530e278.pdf
    • https://static.usrfiles.com/ugd/b8c837_06db17e6207a4202b155e66128dde9ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd0d0913464c447e8d33514485477726.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_off00008fad.bin
06ada0b8420ea92f2fca50c253da02e04612f315040f8d4ae4cbfac3bab63881		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FAD 5004 bytes
font_01_sfnt_off0000a0b9.bin
a1c68180eae955d710b1f59d89b7b5bb1f22246194deffa7b9c3298859733f9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0B9 2140 bytes
font_02_sfnt_off0000aa91.bin
402da761e4b7e5b0446dd45932c14a144bd6c6fe7bac8ff892f649630cbed0b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA91 15440 bytes
font_03_sfnt_off0000db77.bin
c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 16092 bytes

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