Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be93f4912ea1995…

MALICIOUS

PDF

47.6 KB Created: 2020-08-24 23:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ffd7a91c8d75195ca4f73b95bf6789d SHA-1: 925c04286699d460e52efe729bb8437f81631ad3 SHA-256: 3be93f4912ea1995a9acab8464cbd01c5bfbeabbf5305322f34ad48e4551b4e5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a high number of embedded links, many of which point to a known malicious redirector infrastructure. The document body, though partially corrupted, contains the URL that leads to the redirector, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the analysis of specific execution behaviors.

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=benim+hocam+kpss+co%25C4%259Frafya+ders+notlar%25C4%25B1+pdf
    • http://bibatoka.trinaeliza.com/uploads/1/3/2/7/132741099/bevudaxugi.pdf
    • http://files.panisangelicuspress.com/uploads/1/3/1/3/131384018/7094245.pdf
    • https://cdn.shopify.com/s/files/1/0431/0161/8330/files/barron_toeic.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51994241049.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6656/files/environmental_causes_of_mental_illness.pdf
    • https://cdn.shopify.com/s/files/1/0434/0357/5447/files/lutezejufir.pdf
    • https://cdn.shopify.com/s/files/1/0428/3239/6447/files/39359317482.pdf
    • https://cdn.shopify.com/s/files/1/0437/6854/5442/files/luvoxe.pdf
    • https://cdn.shopify.com/s/files/1/0436/5369/3593/files/gastrocnemius_strengthening_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0432/2308/9307/files/risoguzotetu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/jujited.pdf
    • https://cdn.shopify.com/s/files/1/0432/0781/9422/files/31919092001.pdf
    • https://cdn.shopify.com/s/files/1/0440/6912/6309/files/wafipuzukapuwelagu.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/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005063.bin
22639e7f731fbd78701b1d02dc5e7cbe45bc30721067b2e91bbeb92cbb46a476		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5063 5872 bytes
font_01_sfnt_off0000642a.bin
46a7e0d488847eca04ff8942f3fc24dc26123502c3e01c43338451113317c70e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x642A 5864 bytes
font_02_sfnt_off0000744a.bin
8aa0ba281e2e1c2dabf35ecc815d04a6fa565b19dfa44ca898afecc5ce692326		 pdf-font-stream PDF embedded font (sfnt) at offset 0x744A 11696 bytes
font_03_sfnt_off000098c8.bin
7e0863d6dcdfe3ce59f67395a06e5e8634226e44f713773c85e494ff6d119ee1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98C8 16344 bytes

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