Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f420874fdbe90ad…

MALICIOUS

PDF

44.1 KB Created: 2020-08-24 09:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36cee293e357d2e2d0836d31eae4aea2 SHA-1: 7b674767cb1c615b3efd92157f7797644174682c SHA-256: 1f420874fdbe90ad382e198b69aa55fda4ffe53ac15aded3f26019609887898a
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at 'ttraff.ru'. The document body text, though garbled, includes 'Minecraft pc game demo', suggesting a lure to entice users to click the malicious link. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports a malicious intent to redirect users to potentially 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.ru/pify?keyword=minecraft++pc+game+demo
    • http://rumupamu.floriaanwent.com/uploads/1/3/0/7/130738546/70cca6ea19f96.pdf
    • http://files.ronsokolbooks.com/uploads/1/3/0/9/130969655/7649fc9.pdf
    • http://lesixoga.cedartreeproject.com/uploads/1/3/1/4/131412713/f3bb4.pdf
    • http://wonujile.graceforeachmoment.com/uploads/1/3/1/3/131384635/8768824.pdf
    • http://files.kaucoffee.com/uploads/1/3/1/8/131856160/bamuziji-bogomuxop.pdf
    • https://cdn.shopify.com/s/files/1/0448/3615/9645/files/ronemapererubaz.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/pisurodimunifod.pdf
    • https://cdn.shopify.com/s/files/1/0435/3212/4312/files/12216376669.pdf
    • https://cdn.shopify.com/s/files/1/0433/5383/3637/files/sunirowubisavefokabegos.pdf
    • https://cdn.shopify.com/s/files/1/0430/0426/4602/files/roads_of_rome_4.pdf
    • https://cdn.shopify.com/s/files/1/0433/4593/6534/files/xibabadegavin.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/smith_and_wesson_645.pdf
    • https://cdn.shopify.com/s/files/1/0438/2277/6480/files/buwejufepusirogilunev.pdf
    • https://cdn.shopify.com/s/files/1/0431/4241/4493/files/gotivu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0253/5840/files/27008352569.pdf
    • https://cdn.shopify.com/s/files/1/0432/0883/5229/files/playbox_ios_10.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_off00006d6d.bin
f0c88a46380852c5cd48217fa6934011abeb7e7e2fceca1bd390f6a03dddd7cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6D 5272 bytes
font_01_sfnt_off00007f45.bin
adf7b6431f6cefa81aafe11af9652c14c9401f4afd712831997a305c5196411a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F45 10696 bytes