Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb4d9683c8d5c65…

MALICIOUS

PDF

49.7 KB Created: 2020-08-18 13:40:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c0ddda7fef4cc528d668d5932af0bb9 SHA-1: 7f00fd606b1e8be43f9c023560f42db6ccea63fe SHA-256: 2cb4d9683c8d5c657737fc83d57b97a6ee851554fe142dd8c810fb84c80e57d3
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link pointing to ttraff.ru, which is known malicious infrastructure. The document body, though heavily obfuscated, contains the target URL and appears to be a lure related to sports news. The ML classifier strongly indicated maliciousness. The primary attack vector is likely social engineering via a malicious link embedded within the PDF.

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=bk+nets+bleacher+report
    • http://lasekusa.midmichiganfamilyfun.com/uploads/1/3/0/7/130775432/504451.pdf
    • http://fuxumo.tfgflies.com/uploads/1/3/2/7/132740214/vadatowazojelalilo.pdf
    • http://files.americanfriendsofthefatherbashfoundation.org/uploads/1/3/1/4/131437311/rapilowas_kuwibamet.pdf
    • http://files.thecatandthecrystal.com/uploads/1/3/0/7/130775567/5fe9d5754a1074c.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5675/files/34073710273.pdf
    • https://cdn.shopify.com/s/files/1/0430/6924/3549/files/7288492948.pdf
    • https://cdn.shopify.com/s/files/1/0430/6432/8345/files/aithihyamala_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0434/1543/7468/files/dilebopinowifaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4457/files/free_online_hidden_objects_games_no_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/8393/0527/files/33680839003.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/waxevuge.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/vapunukobalibabiruvinefa.pdf
    • https://cdn.shopify.com/s/files/1/0428/8089/3084/files/70226755914.pdf
    • https://cdn.shopify.com/s/files/1/0435/9133/6099/files/aprendizajes_clave_primero_de_primaria.pdf
    • https://cdn.shopify.com/s/files/1/0427/5663/6828/files/wezagekitaxowabasetuvera.pdf
    • https://cdn.shopify.com/s/files/1/0437/9597/2256/files/pizop.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/22273578698.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_off000083a3.bin
60459866d7688671afd1608aa7b89e8e61989b5b7effb95d34e864e4466cfb8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83A3 5272 bytes
font_01_sfnt_off00009585.bin
cfd0933ff6fb285ab8b87abd08fe91c7e31f31c3ceb785c1850627ce644d68e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9585 10700 bytes

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