Malicious PDF — malware analysis report

Static analysis result for SHA-256 10976a7b74aff359…

MALICIOUS

PDF

43.7 KB Created: 2020-08-31 09:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e566b3e675df320a50147aabe9f624b SHA-1: 806dce85bfd2f4e5bbf47c5cc28e9b31120bd35f SHA-256: 10976a7b74aff3598abf0748442ad82a0b83977b4da507d5e494dd30626cf74f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.cc/wix?keyword=ally+condie+matched+pdf'. It also exhibits a PDF link farm heuristic, containing numerous links to other PDF files, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious redirector URL and several other PDF URLs, suggesting an attempt to lure 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/wix?keyword=ally+condie+matched+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/6989/8909/files/tivepejuzaxubetafipez.pdf
    • https://cdn.shopify.com/s/files/1/0466/6638/3525/files/deltec_twin_tech_calcium_reactor_for.pdf
    • https://cdn.shopify.com/s/files/1/0448/0771/7024/files/bohemian_rhapsody_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0440/0722/7542/files/discord_text_size.pdf
    • https://cdn.shopify.com/s/files/1/0431/5149/1233/files/bufevotigutamanogupa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8375/1831/files/ragurerowewojaremefogo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9726/8128/files/best_myanmar_travel_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/4398/7357/files/wordly_wise_3000_book_6_lesson_4_answer_key.pdf
    • https://static.usrfiles.com/ugd/73c254_5556881a9bda4984acc57ef78d4effc6.pdf
    • https://static.usrfiles.com/ugd/b8c837_770bf3c3d14943f8bd9de74929a16c86.pdf
    • https://static.usrfiles.com/ugd/b8c837_72ac287dc92f407fb616400383bbedd3.pdf
    • https://static.usrfiles.com/ugd/b8c837_37dda59325b84745b1f6d33c61e9f468.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006112.bin
aedc8b8543d6108406cfeba1f36ebd94240382d30fe771628d0500d8ec532a0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6112 5000 bytes
font_01_sfnt_off000071e5.bin
a33621e83a5f8bdc4ce5fdd5a6c2a2b36c8ba44e06d9747736294dbd943960c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E5 10124 bytes
font_02_sfnt_off00009483.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9483 4324 bytes

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