Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8828f1439f824d…

MALICIOUS

PDF

47.4 KB Created: 2020-08-25 18:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8f3997990f79ade9312818146db3e32 SHA-1: 1ca06e7ebd9d898a5771f8dba610f27d01b4a0cd SHA-256: ab8828f1439f824d2de7a28a4726d4b3bb20f47d3ee83e9d780974b829523e6f
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL and references 'Barthes death of the author pdf', suggesting a lure. The PDF also hosts a large number of external links, many pointing to Shopify, which is flagged as a link farm. The ML classifier strongly indicates maliciousness.

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.com/pify?keyword=barthes+death+of+the+author+pdf
    • http://files.thewoodroom.co.uk/uploads/1/3/0/7/130739060/c1dc2.pdf
    • http://files.hourglasspress.com/uploads/1/3/1/4/131407737/zilavomibemit_raresurebiloxi_gubamorug_wejazi.pdf
    • http://tegopem.grangerlandrfd.com/uploads/1/3/2/7/132741100/43a2b5bff.pdf
    • http://kefulu.mohairslim.com/uploads/1/3/2/6/132682883/192204.pdf
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/39141832393.pdf
    • https://cdn.shopify.com/s/files/1/0429/0658/3203/files/ziwimoruz.pdf
    • https://cdn.shopify.com/s/files/1/0431/2494/9153/files/jifujijera.pdf
    • https://cdn.shopify.com/s/files/1/0429/6572/9429/files/export_ssl_certificate_pem_format.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/meaning_of_social_science_research.pdf
    • https://cdn.shopify.com/s/files/1/0429/1795/3702/files/35964598891.pdf
    • https://cdn.shopify.com/s/files/1/0431/1800/2340/files/wizard_spells_pathfinder.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4495/files/nesasifovexowiludovof.pdf
    • https://cdn.shopify.com/s/files/1/0435/4542/8122/files/85461401628.pdf
    • https://cdn.shopify.com/s/files/1/0433/9394/1671/files/walking_dead_s07e01_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0427/6148/6503/files/bajrangi_bhaijaan_movie_songs_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0431/3533/6616/files/catalogo_tecfil_2016.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_off00006ed9.bin
2b51c8e78b639d0528b70127ddd106388cf4f0bc5a33033e8f84aa73a13365a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED9 4876 bytes
font_01_sfnt_off00007f81.bin
1757658aa002488a407567d82f5e096047e1a9ee62548857db68bbce6febb168		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F81 10076 bytes
font_02_sfnt_off0000a200.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA200 4324 bytes

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