Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c444309a2ed795…

MALICIOUS

PDF

63.1 KB Created: 2020-08-03 06:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07e9fa8c41d946846b640ce72ef439cb SHA-1: 3b204babdcfb42e4515fc6dbe7070221a2cc47cd SHA-256: f6c444309a2ed795238660e98638f3359cd8dd7720d6c436198e0f750d2eae44
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely intended to lure the user into downloading further malware. The document body, though heavily obfuscated, contains the same redirector URL and a reference to 'downloads. ubnt/ unifi', suggesting a social engineering pretext. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=downloads.+ubnt%252F+unifi
    • http://files.strategiesforwriting.net/uploads/1/3/2/8/132814906/wilubelo.pdf
    • http://files.gordonstonemusic.com/uploads/1/3/1/4/131405977/xubiwejutadisof.pdf
    • http://files.osrsinferno.org/uploads/1/3/1/6/131606537/buzep.pdf
    • http://files.columbiaclefhangers.com/uploads/1/3/0/8/130874134/pesasotu.pdf
    • http://files.karenlindemanart.com/uploads/1/3/2/6/132681012/2944350.pdf
    • https://cdn.shopify.com/s/files/1/0430/8484/1124/files/xokeravibesono.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1687/files/81894801045.pdf
    • https://cdn.shopify.com/s/files/1/0430/7773/0464/files/37147037046.pdf
    • https://cdn.shopify.com/s/files/1/0428/2259/8823/files/wuwel.pdf
    • https://cdn.shopify.com/s/files/1/0437/6467/8807/files/xujonosog.pdf
    • https://cdn.shopify.com/s/files/1/0427/7141/5196/files/copper_pickaxe_stardew.pdf
    • https://cdn.shopify.com/s/files/1/0437/7051/1521/files/pofapugaxudokizederufiv.pdf
    • https://cdn.shopify.com/s/files/1/0439/3864/4136/files/renuzozusadigazawexa.pdf
    • https://cdn.shopify.com/s/files/1/0437/0799/0169/files/xemixipewukopevoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/9975/8497/files/42159533186.pdf
    • https://cdn.shopify.com/s/files/1/0428/7086/6087/files/navepofonibusiwo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8395/files/83049557913.pdf
    • https://cdn.shopify.com/s/files/1/0429/2100/1119/files/45995646173.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009090.bin
7bb08eaf5a2bb2e0a00d36992f9b6355b7151d4a05566f4c09f90462a1dc00a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9090 4868 bytes
font_01_sfnt_off0000a134.bin
6b3b9873a68b533f1c97ced997ff434a7bf8aaa48e374b8cabac308316ab959c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA134 9272 bytes
font_02_sfnt_off0000bb75.bin
1fa1dc48e367db9d4fab1a8f2c5b9e12d3646261803d1b3e915b0073a69b6466		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB75 10972 bytes
font_03_sfnt_off0000e0ba.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BA 4324 bytes

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