Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe6e90acb23646c…

MALICIOUS

PDF

52.8 KB Created: 2020-08-09 14:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5913ed5469392c87024939ba8296aea SHA-1: 4798aaadecb8f68eeb7907c51f7015698d3a0762 SHA-256: bfe6e90acb23646c9d4caee05f3facf332fa5e460d9baea94033eeb8e2580c5d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to Shopify domains. The document body, though heavily obfuscated, contains the same URL as the malicious redirector, suggesting an attempt to disguise malicious content as a catalog. 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.ru/pify?keyword=catalogo+bisagras+para+soldar+pdf
    • http://jonuba.botanicalgardenphotography.com/uploads/1/3/1/3/131398140/fupevej-jeneg-wirigin.pdf
    • http://files.aspontaneoustraveler.com/uploads/1/3/1/4/131438539/xomadu.pdf
    • http://files.rochesterphoenixmartialarts.com/uploads/1/3/1/4/131453354/77ee6.pdf
    • https://cdn.shopify.com/s/files/1/0432/3734/3387/files/young-_kenny_chesney_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/0692/6741/files/30959980054.pdf
    • https://cdn.shopify.com/s/files/1/0430/5820/0725/files/toruliwubatixepubanis.pdf
    • https://cdn.shopify.com/s/files/1/0431/7973/7237/files/17809416500.pdf
    • https://cdn.shopify.com/s/files/1/0436/3275/4841/files/relational_database_design_and_sql.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/tapawopawexiluxaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/6173/0718/files/trumpet_breathing_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/build_me_up_buttercup_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/1975/4907/files/59692205016.pdf
    • https://cdn.shopify.com/s/files/1/0436/4887/6697/files/fezotavufu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5494/files/35342312084.pdf
    • https://cdn.shopify.com/s/files/1/0440/8036/5720/files/sapef.pdf
    • https://cdn.shopify.com/s/files/1/0435/3448/3616/files/kagafoz.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_off00008443.bin
d8608f6f8309ab48dff367edc76fce05134e4bf3a9af155ab63ebd05dafcb23d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8443 5256 bytes
font_01_sfnt_off00009625.bin
ed1c5dcec05faf7a5616024af9f82f9ff9ec8ccbe3f66babd82dcd46f744a183
pdf-font-stream PDF embedded font (sfnt) at offset 0x9625 16160 bytes