Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a5a2c4dc597447…

MALICIOUS

PDF

65.3 KB Created: 2020-08-20 06:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b69cb7a2ff0d7ff08b406da4d59afd48 SHA-1: 17df50ec39b68ee2113557e4f01fe792cc188c58 SHA-256: 67a5a2c4dc59744724704ae482dd70acf9bcbd0054dbf6b5f5bc885f29cd68b1
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 Shopify domains hosting PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely the primary malicious payload delivery mechanism. The document body itself is heavily obfuscated and contains the malicious URL, indicating an attempt to disguise its true purpose.

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=chamma+chamma+new+song+dance+performance
    • http://pidugojan.maritimeqha.com/uploads/1/3/1/4/131454731/919369.pdf
    • http://files.david-jones-society.org/uploads/1/3/1/0/131070192/babevuwemari.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/54582679447.pdf
    • https://cdn.shopify.com/s/files/1/0433/8221/0725/files/tutisijirumi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1281/files/wibewin.pdf
    • https://cdn.shopify.com/s/files/1/0432/3010/1668/files/signs_of_bed_bugs_on_your_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0452/5889/9618/files/92359177919.pdf
    • https://cdn.shopify.com/s/files/1/0446/8729/4617/files/antiferromagnetic_materials.pdf
    • https://cdn.shopify.com/s/files/1/0436/0686/8126/files/mewumo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71061356311.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6472/files/mejiguwopujojim.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/fenesagakodeger.pdf
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/futovejotutetol.pdf
    • https://cdn.shopify.com/s/files/1/0428/8679/1334/files/stop_words_nltk.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007971.bin
bfeb5a8180246724187b1d760782f2619f8d94a733fcfbca5e6929e83ebca35f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7971 6960 bytes
font_01_sfnt_off00008b36.bin
f9d44eb86ebd7cf7023226d5cc2b0075dcfb699fa5255ff6ecae13dfef565dc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B36 5312 bytes
font_02_sfnt_off00009d25.bin
40ff778f8ee30128c81fe7d4e7099c2c9704ce9821180d39d415dbaa63067140		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D25 16032 bytes
font_03_sfnt_off0000cec3.bin
71bd82ef5af600839abc3829ad42885b7b6728eb66b8f8ce5129b81d4638b6be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC3 16948 bytes
font_04_sfnt_off0000e6f4.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F4 4324 bytes

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