Malicious PDF — malware analysis report

Static analysis result for SHA-256 51da7f7070d032cd…

MALICIOUS

PDF

58.2 KB Created: 2020-07-25 11:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9de4e82aa6c2868fb3c7adcb73353a9 SHA-1: 686509a178a13914aa78696fc701f89b0cdff592 SHA-256: 51da7f7070d032cd8d29588f47be4ce031621d4189e0bb04874a4eaaf9b16c63
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains numerous embedded links, with the primary heuristic identifying a link to a known malicious redirector at 'ttraff.ru'. This suggests the document's purpose is to redirect users to potentially harmful content. The presence of a PDF link farm further supports this, indicating an attempt to manipulate search engine results or distribute malicious links broadly. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=aac+file+format+stack+overflow
    • http://files.talentedtradesman.co.uk/uploads/1/3/1/6/131606502/9ff8945.pdf
    • http://files.aledobandboosters.org/uploads/1/3/2/6/132681946/8067431.pdf
    • http://files.thelandfillchronicles.com/uploads/1/3/0/7/130739837/98076.pdf
    • http://files.flyzephyr.com/uploads/1/3/1/3/131398423/zekiru_pidezariviz_segozilafifege_kifutop.pdf
    • http://files.jordanlutheran.org/uploads/1/3/2/6/132681307/tuxelowisitisex.pdf
    • https://cdn.shopify.com/s/files/1/0433/9954/4984/files/91877157803.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fakuwonilojovaxibudebu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1175/1579/files/78601055662.pdf
    • https://cdn.shopify.com/s/files/1/0430/7383/1072/files/57404269875.pdf
    • https://cdn.shopify.com/s/files/1/0432/8642/9861/files/19803254500.pdf
    • https://cdn.shopify.com/s/files/1/0430/5669/3397/files/55900320642.pdf
    • https://cdn.shopify.com/s/files/1/0435/4031/6319/files/80676184020.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/piwogiwilaxisev.pdf
    • https://cdn.shopify.com/s/files/1/0430/0665/6666/files/14316909376.pdf
    • https://cdn.shopify.com/s/files/1/0435/2786/4469/files/65037751744.pdf
    • https://cdn.shopify.com/s/files/1/0434/7586/1656/files/vasujetabukepegovuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7287/files/73310433424.pdf
    • https://cdn.shopify.com/s/files/1/0437/1247/9382/files/gefibevupudeminuwuzovetu.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_off00009e10.bin
6b7fba6d60221a3604a3da4246f5128b8745086e5b09953a2233edb45edf0095
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E10 4912 bytes
font_01_sfnt_off0000aed0.bin
4472bffc394f54301efd29cc57476b87552673b47dce3b994bb2ec28c886426b
pdf-font-stream PDF embedded font (sfnt) at offset 0xAED0 14216 bytes