Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce75e1cab4a666a4…

MALICIOUS

PDF

55.7 KB Created: 2020-09-01 02:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa6c3ade4bc6923f227d7e45a7652f5e SHA-1: b815c25590e1d140cf132b1f516c341473be4e54 SHA-256: ce75e1cab4a666a4db7beffa105cd0a23a2571771853067044d359948cea5a04
152 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc'. The document body, though partially obfuscated, includes the same URL, suggesting a lure to entice users to click. Additionally, a high number of embedded links to external PDFs were found, many hosted on Shopify, indicating a link farm strategy. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=adaalat+season+1+episode+3
    • https://cdn.shopify.com/s/files/1/0430/1648/7065/files/43766255986.pdf
    • https://cdn.shopify.com/s/files/1/0461/6083/8808/files/mawejabapukenoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0101/1611/files/30992741330.pdf
    • https://cdn.shopify.com/s/files/1/0431/7039/8362/files/auscultation_pulmonaire.pdf
    • https://cdn.shopify.com/s/files/1/0437/5884/6110/files/cakephp_complete_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0461/3432/9497/files/dodobaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3435/files/harry_potter_hermione_images.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/xejub.pdf
    • https://cdn.shopify.com/s/files/1/0435/3028/9311/files/arabic_calligraphy_learning.pdf
    • https://cdn.shopify.com/s/files/1/0438/1098/0000/files/6817763437.pdf
    • https://static.usrfiles.com/ugd/c33cdb_f88568aa6bf74ed68941e97971f0147e.pdf
    • https://static.usrfiles.com/ugd/18122d_a1e3850e78f84cf7949ecef4ac575b9a.pdf
    • https://static.usrfiles.com/ugd/cafc24_d65ae6cbede34b978c1963048fdfa4f1.pdf
    • https://static.usrfiles.com/ugd/c63dba_0303fbc27ad941cab62b46f9bbba1096.pdf
    • https://static.usrfiles.com/ugd/b8c837_1505b55887c0471ea6653e924c00a7b1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008374.bin
ac00dd87e3a7d3b125610e5d7134e3b2858d6add8da64fec3a07339886244462		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8374 4848 bytes
font_01_sfnt_off00009403.bin
79e5a57797d18031a7d5a9b8d9f7767add9cbb52a568ef29f52ab10e9aef0a66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9403 15436 bytes
font_02_sfnt_off0000c3d8.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D8 4324 bytes

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