Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05d8450ca8221f1…

MALICIOUS

PDF

46.2 KB Created: 2020-07-31 14:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc3662d260901660e338dea261a44200 SHA-1: ae5e279246ecec2e0231403a7fe24fe6d2b21030 SHA-256: c05d8450ca8221f122a141298ffa964f014a0f14960248b4a135c81f29473d5c
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to contain metadata related to PDF creation and administrative letter writing, suggesting a lure. The primary attack vector appears to be a link farm designed to redirect users to malicious content.

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.cc/wb?keyword=comment%20ecrire%20une%20lettre%20administrative%20en%20francais%20pdf
    • http://files.bakmonastery.com/uploads/1/3/1/4/131437532/b5c13.pdf
    • http://files.odomengineering.com/uploads/1/3/0/7/130738531/54540f5238e5.pdf
    • http://files.gratitudeismyreligion.com/uploads/1/3/1/1/131163492/segugilagisux-xixatubalewo.pdf
    • http://files.spartafbo.com/uploads/1/3/1/3/131383889/zemokevirisebiv_gaperazefame_rivabiditu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/wixas.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98908457197.pdf
    • https://cdn.shopify.com/s/files/1/0436/4494/4542/files/34286885361.pdf
    • https://cdn.shopify.com/s/files/1/0430/4797/7114/files/6535898806.pdf
    • https://cdn.shopify.com/s/files/1/0440/3652/2149/files/lataf.pdf
    • https://cdn.shopify.com/s/files/1/0435/1596/9688/files/81462927794.pdf
    • https://cdn.shopify.com/s/files/1/0439/8995/8814/files/kamofofekanofozuwexanaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5229/files/78001089878.pdf
    • https://cdn.shopify.com/s/files/1/0439/1708/2792/files/74790253427.pdf
    • https://cdn.shopify.com/s/files/1/0431/2065/6545/files/tufijitekikivebuzovu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3046/3142/files/37245554089.pdf
    • https://cdn.shopify.com/s/files/1/0428/9026/4742/files/12573355366.pdf
    • https://cdn.shopify.com/s/files/1/0435/7803/2296/files/29915789438.pdf
    • https://cdn.shopify.com/s/files/1/0435/8579/8301/files/rokasikisa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000714e.bin
11d054b7d8c60bc8bb86ff73ea924e0ac50a37920874b05fd7b576390ec9c280		 pdf-font-stream PDF embedded font (sfnt) at offset 0x714E 5264 bytes
font_01_sfnt_off0000831f.bin
ea2890ac56ebc4d57d5cc41f94791c10ae99f101be4b772c7d60ca7881bdef29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x831F 11992 bytes

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