Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd4e1866e13108c…

MALICIOUS

PDF

38.4 KB Created: 2020-08-15 21:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9b4f3a608ba7817428897c9008652ff SHA-1: a6636567d822a303a8a39c2e83ed44ad199162ab SHA-256: dbd4e1866e13108c20512a52d9b66c3ad92ae0d1946537e515420e4913c951dc
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 identifying a link to a known malicious redirector at `https://ttraff.cc/wb?keyword=feeling%20worksheet%20for%20kindergarten%20pdf`. Another critical heuristic indicates a PDF link farm, with many links pointing to shopify.com domains, likely for SEO poisoning to improve search engine ranking for malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links within the document.

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/wb?keyword=feeling%20worksheet%20for%20kindergarten%20pdf
    • http://xuwozo.heatyukonvc.com/uploads/1/3/2/6/132681484/9b6d53.pdf
    • http://files.labellaglo.com/uploads/1/3/1/8/131856713/jaxati_kozokufipepagod.pdf
    • http://files.thegloriagoldshow.com/uploads/1/3/0/8/130874204/9e4adb5660.pdf
    • https://cdn.shopify.com/s/files/1/0428/8725/0087/files/80726486212.pdf
    • https://cdn.shopify.com/s/files/1/0433/8365/2506/files/74681471583.pdf
    • https://cdn.shopify.com/s/files/1/0428/8721/7319/files/62497383452.pdf
    • https://cdn.shopify.com/s/files/1/0432/0247/8237/files/14621296070.pdf
    • https://cdn.shopify.com/s/files/1/0431/8792/9252/files/91269339775.pdf
    • https://cdn.shopify.com/s/files/1/0429/0409/2839/files/arnold_ehret_mucusless_diet.pdf
    • https://cdn.shopify.com/s/files/1/0433/7372/3800/files/zipowagikosoxopojemokelix.pdf
    • https://cdn.shopify.com/s/files/1/0429/6871/1321/files/20374286633.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/72301276044.pdf
    • https://cdn.shopify.com/s/files/1/0437/0127/2729/files/jinoxagaz.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_off00005772.bin
9a115cb1b0542af744a3b83258d8c301ee1f7e75f0c9a8412c816a009da2d9fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5772 5412 bytes
font_01_sfnt_off000069ef.bin
b74277d854af55b7b2083f2175d629f5aec085c36c65e1544fccc91a05a2ceda
pdf-font-stream PDF embedded font (sfnt) at offset 0x69EF 10148 bytes