Malicious PDF — malware analysis report

Static analysis result for SHA-256 9828787c66a763b6…

MALICIOUS

PDF

43.2 KB Created: 2020-08-10 23:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 047ae65d7c1809d00134ee69f3370691 SHA-1: f30fc17b4615448997e1d21278c537fcd202ae0e SHA-256: 9828787c66a763b6150962e46101ea8f2d1d58dcdc9e51b59353f833f73b2a1a
150 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that this URL is part of malicious infrastructure. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL that is also flagged as malicious.

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=dieta+saludable+definicion+pdf
    • http://files.eclecticcontent.com/uploads/1/3/2/3/132303238/5970732.pdf
    • http://files.stonecoldqueen.com/uploads/1/3/1/6/131606758/c93d21226f036b.pdf
    • http://files.boundtogethercounseling.com/uploads/1/3/0/8/130814439/7698201.pdf
    • http://files.mothershands.org/uploads/1/3/0/7/130776110/pidebemivow.pdf
    • https://cdn.shopify.com/s/files/1/0435/4356/0351/files/overlord_volume_10.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/muretodexileleb.pdf
    • https://cdn.shopify.com/s/files/1/0431/7832/8221/files/4279431194.pdf
    • https://cdn.shopify.com/s/files/1/0431/3756/4823/files/belesitoxamunuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gifowugebivagobawogun.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/the_apocryphal_books_of_the_new_testament.pdf
    • https://cdn.shopify.com/s/files/1/0448/2914/7293/files/ejercicios_resueltos_de_capacitores_mixtos.pdf
    • https://cdn.shopify.com/s/files/1/0430/8375/9765/files/free_download_adobe_reader.pdf
    • https://cdn.shopify.com/s/files/1/0431/2399/8874/files/21486957915.pdf
    • https://cdn.shopify.com/s/files/1/0433/8463/5544/files/35031552509.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5941/files/dumufesureli.pdf
    • https://cdn.shopify.com/s/files/1/0437/6110/7105/files/42703081617.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_off00006b7a.bin
45fbbea46b1b6927fd7eeea2ca3db5e05be88c20111f833a3a3b9288c0461dfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7A 5192 bytes
font_01_sfnt_off00007d28.bin
a477c9721419ac80ed8973fdc154d31f87ff4322d90928e1e89a1621714e1452
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D28 10252 bytes