Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ee35d7bb00e38e…

MALICIOUS

PDF

46.1 KB Created: 2020-08-12 04:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c627dfc1e9b352f710f3e438db502de2 SHA-1: 7b6a2673f9ae29fe09ac0d0e7965b5cb76a7bcca SHA-256: f9ee35d7bb00e38edc635b94eaf62f0407e0391edb38ea2d59a0f716f8286a7b
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'airport codes pdf download' and the malicious URL. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful 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/pify?keyword=airport+codes+pdf+download
    • http://files.jaztalks.com/uploads/1/3/2/6/132681315/soxaxagarog.pdf
    • http://files.bwmin.org/uploads/1/3/1/3/131379434/9989416.pdf
    • http://files.californiadaylilies.com/uploads/1/3/1/6/131636584/molurenovuxoxinituwi.pdf
    • http://renukigeg.balticsportsciencesociety.com/uploads/1/3/0/8/130874064/b03d364.pdf
    • https://cdn.shopify.com/s/files/1/0435/3448/3616/files/65019578268.pdf
    • https://cdn.shopify.com/s/files/1/0431/2779/9969/files/star_wars_republic_commando_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5830/6965/files/74186292930.pdf
    • https://cdn.shopify.com/s/files/1/0452/3737/1037/files/sars_bursary_application_forms_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/5486/6333/files/bsc_first_year_botany_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/5688/2086/files/44217019083.pdf
    • https://cdn.shopify.com/s/files/1/0435/5594/6645/files/jegevawulububewefogarapof.pdf
    • https://cdn.shopify.com/s/files/1/0438/5567/5542/files/seriku.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xuvoba.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71895612735.pdf
    • https://cdn.shopify.com/s/files/1/0433/8126/0440/files/xefakusegubosuzerape.pdf
    • https://cdn.shopify.com/s/files/1/0437/7218/2689/files/vupivuvusigapateg.pdf
    • https://cdn.shopify.com/s/files/1/0439/4260/9051/files/pekaporaretonesesotesu.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_off0000763d.bin
169a5cd1f5f5f8554b6aa542b085e6d05adef1e2dd3db8ec0abf3616fd73e068
pdf-font-stream PDF embedded font (sfnt) at offset 0x763D 5228 bytes
font_01_sfnt_off00008824.bin
86191814b71567e1e516daa513e78d3edbecf436116ed5bb102d69fd137bf4e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8824 10392 bytes