Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e11b03949944c8…

MALICIOUS

PDF

47.6 KB Created: 2020-09-07 02:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abf1d25cdfa9c4cc4503d334197c1b03 SHA-1: aa8924b30f46d7dd0e0ff59a1a37efa9c64f070f SHA-256: 08e11b03949944c8229a6d60d6bfee06bacd20c8b7da76f43b7d1901d34014b9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'wallpapers' and a URL that appears to be part of this redirection scheme.

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.me/wix?keyword=best+wallpapers+for+android+mobile
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b4609a_ea75e05c5d7240b39aa272ae17e8159f.pdf
    • https://static.usrfiles.com/ugd/efb3f0_d36ec7fcf7ea4cacaa004914a2d727d0.pdf
    • https://static.usrfiles.com/ugd/1a89c8_fce398d818b9452b8650627b3ca7eb3f.pdf
    • https://static.usrfiles.com/ugd/65b209_7ca5f3f2819c4be192942a830d4c3e2c.pdf
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/82359296082.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5266/files/us_citizenship_test_immigration_naturalization_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/2222/9397/files/xetefapip.pdf
    • https://cdn.shopify.com/s/files/1/0437/8954/9726/files/40038068411.pdf
    • https://static.usrfiles.com/ugd/71fd01_8009dd1982da4187a9a98701e1a8631c.pdf
    • https://static.usrfiles.com/ugd/353d00_d08a7ebf51024de8abd11c57b52bbe17.pdf
    • https://static.usrfiles.com/ugd/f103bb_fa3d841fa92040f48e94c7904452196c.pdf
    • https://static.usrfiles.com/ugd/d1fcfc_cc6cb5019d9e466badcda0296bdf7071.pdf
    • https://static.usrfiles.com/ugd/0511f5_001a2f1581b14e71ad10fe664e9aed16.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5805/files/interior_angles_of_polygons_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/25964824128.pdf
    • https://cdn.shopify.com/s/files/1/0428/3092/1894/files/83755437507.pdf
    • https://cdn.shopify.com/s/files/1/0437/8466/7287/files/71533617235.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c93.bin
6072d787c723d0705e5e64db03ca3d27a8f8bc4dba05c4e56833f3d4a676c199		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C93 5468 bytes
font_01_sfnt_off00008f23.bin
67896d0a4bbde1144a8eca52d27d7f73b90a5cf5c24c14875667d0076d819f5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F23 9948 bytes

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