Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f4a021d5d9075a…

MALICIOUS

PDF

49.1 KB Created: 2020-08-08 15:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbfc36c9cd503191a56c2a3f0bb22474 SHA-1: 45de2b0dedb8caf21a7f2fffafb56c44c653e68d SHA-256: b4f4a021d5d9075ad9331912b4663d1eaf227c35fd5746479d86b4f0d380910e
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'Carlos Drummond de Andrade books in PDF' and a URL that appears to be part of a redirection scheme. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is used for malicious redirection.

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=carlos+drummond+de+andrade+livros+em+pdf
    • http://files.kathryncacho.com/uploads/1/3/1/4/131407106/wowoweriza_fawapokazid_sibifulozi_lowizoliwolafa.pdf
    • http://files.lcsupperclub.com/uploads/1/3/1/4/131406736/1643772.pdf
    • http://puzem.deleswaproductions.com/uploads/1/3/0/8/130874493/3983258.pdf
    • http://files.gapeachclean.com/uploads/1/3/2/3/132303312/2346569.pdf
    • http://files.bluetonemusicusa.com/uploads/1/3/2/3/132302907/405684abadf4.pdf
    • https://cdn.shopify.com/s/files/1/0435/8648/6440/files/68276034698.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/cfa_curriculum_level_2.pdf
    • https://cdn.shopify.com/s/files/1/0432/8233/3856/files/wamupu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0081/6028/files/coleman_popup_parts.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/52877379397.pdf
    • https://cdn.shopify.com/s/files/1/0430/5040/1945/files/5415101725.pdf
    • https://cdn.shopify.com/s/files/1/0434/2661/1357/files/banidonadekuxazupa.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/2998/files/basic_english_grammar_notes.pdf
    • https://cdn.shopify.com/s/files/1/0437/5461/9041/files/ruweramarikas.pdf
    • https://cdn.shopify.com/s/files/1/0431/6512/2711/files/advanced_dungeons_and_dragons_monster_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/0939/2285/files/16781844247.pdf
    • https://cdn.shopify.com/s/files/1/0433/9816/8743/files/74632693582.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_off00007e84.bin
a31519110761d89e0450b3eb0cda15f1ce7def58ce7b22d690ca4d106c60bb1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E84 5152 bytes
font_01_sfnt_off00008ff6.bin
33e077b3085cfcba84ba04070633a236c151e612509d52b2e16986a7a7c7738d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF6 12904 bytes

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