Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0b1c18307fae0e…

MALICIOUS

PDF

60.1 KB Created: 2020-08-14 14:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfb89a72e43fa7c54ccc4981a6d2c247 SHA-1: 0b8ce491027dcafe414a6a8e6270af80c945ce51 SHA-256: 8b0b1c18307fae0e87beb612f6f7c1bbfcc8a85b1d16c7a41e4f88fde8459915
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=beholder+5e+sheet', is flagged as a malicious redirector. The document also exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting a lure to external malicious 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=beholder+5e+sheet
    • http://bekuga.bohannonfilmvideo.com/uploads/1/3/2/8/132814930/8287372.pdf
    • http://files.spartandecocrete.com/uploads/1/3/0/7/130738821/dusuworiwuxavuzu.pdf
    • http://files.pugetsounddoulas.com/uploads/1/3/1/4/131452958/zerojonifogade.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2229/files/jakipelonedafa.pdf
    • https://cdn.shopify.com/s/files/1/0430/2071/4137/files/24778998292.pdf
    • https://cdn.shopify.com/s/files/1/0428/6801/5260/files/bejajafe.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/jorexelisibotozidodulitaj.pdf
    • https://cdn.shopify.com/s/files/1/0438/4089/7189/files/70067050695.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4619/files/80453031809.pdf
    • https://cdn.shopify.com/s/files/1/0438/0826/0258/files/post_tensioning_manual_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/0017/6544/files/jurififisarizivake.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/tupunetojile.pdf
    • https://cdn.shopify.com/s/files/1/0440/7253/4168/files/history_of_buganda_kingdom.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7222/files/62860774888.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0202/files/rimworld_alpha_15_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0452/5346/0130/files/color_by_number_multiplication_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/5789/7882/files/manual_chevrolet_captiva_2020_espaol.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_off0000a6d4.bin
f3b7c6f4df9b89ee584b8bdaa253f0b45b7f7f7d0da6beba1382c40f4ca7a72c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6D4 4876 bytes
font_01_sfnt_off0000b763.bin
9ffde11a6e04aeb647ebc003ca47fae2ffbc834d270ab64c6729d2a179eab730		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB763 14112 bytes

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