Malicious PDF — malware analysis report

Static analysis result for SHA-256 14c571b1b5a1fc91…

MALICIOUS

PDF

55.6 KB Created: 2020-08-30 07:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab7ca88602d7ba983b4fd3deee5beec4 SHA-1: 2d722f667e46d1a86ba70174ab1eeaf9a51dda6e SHA-256: 14c571b1b5a1fc9161a3f48aa24b7a58427604d66b9ec921d84f19d075f92a2d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains text that suggests it is a 'price guide', aligning with the redirector's keyword parameter. The PDF also contains a large number of links to Shopify-hosted PDFs, likely as part of a link farm to improve SEO for the 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/wix?keyword=yorehab+tag+yoville+price+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3129/6160/files/35954084454.pdf
    • https://cdn.shopify.com/s/files/1/0435/1610/0776/files/sahih_bukhari_bangla.pdf
    • https://cdn.shopify.com/s/files/1/0451/1930/7929/files/dajate.pdf
    • https://cdn.shopify.com/s/files/1/0437/6517/0334/files/the_hobbit_the_desolation_of_smaug_extended_subtitles_english.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vunazazaxukatokezidabu.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1388fc8b3d64c2992cb931b9f52fd4a.pdf
    • https://static.usrfiles.com/ugd/b8c837_f2813e3612024092b46563c5f60a23ff.pdf
    • https://static.usrfiles.com/ugd/d78803_002c443091354954b1d3e61dcff52d20.pdf
    • https://static.usrfiles.com/ugd/b8c837_08e756bc544b49d0911562dc1fd8912a.pdf
    • https://static.usrfiles.com/ugd/72216b_3f1d61f088f8440992e82900485bbb1a.pdf
    • https://static.usrfiles.com/ugd/9374a7_99e844a54e80486e87c33211d09e0540.pdf
    • https://cdn.shopify.com/s/files/1/0438/7844/9307/files/57032757719.pdf
    • https://cdn.shopify.com/s/files/1/0434/0265/7957/files/r_kelly_its_your_birthday.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061e8.bin
b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61E8 6744 bytes
font_01_sfnt_off0000729c.bin
8fa81f59688ca67b1a2ab8c17f0269db9ab090d02939f629eaa941a405697012		 pdf-font-stream PDF embedded font (sfnt) at offset 0x729C 5476 bytes
font_02_sfnt_off00008543.bin
82fddc092756b399e1fffbdf822c713ae526e0044c6bdf9dc76ff4ca34ffd0da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8543 5420 bytes
font_03_sfnt_off000097a6.bin
3eadf3ff1ae85f7a2dd8be852d633ca148c1d24200a16cbd4325889adc5789c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97A6 2140 bytes
font_04_sfnt_off0000a180.bin
e5d00877a7c0ddff98ced5dafa86af49bc3ca07fa10ff76ca80e56cad2caa141		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA180 14468 bytes

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