Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc75e0084b3f04f…

MALICIOUS

PDF

57.6 KB Created: 2020-08-08 03:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a300b434e93979f4d375eece3457b1c SHA-1: 14093de9c1d9fc0418fbd294d18f05f087e660da SHA-256: 9bc75e0084b3f04f2a81accf46ce8aed386d0e642fb5a0aaf098bc5e7d650d36
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to Shopify domains, but one critical link to 'ttraff.ru' which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=grade+12+maths+probability+notes+pdf', suggesting a lure to download further malicious content disguised as educational material. The ML classifier strongly supports the malicious nature of this PDF.

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=grade+12+maths+probability+notes+pdf
    • http://files.bradenriverpirateffa.com/uploads/1/3/2/6/132682030/fuvido_gazukud_xojumekibululus.pdf
    • http://files.friendsofhoddlescreek.com/uploads/1/3/2/8/132815979/gijip-nepefeweb.pdf
    • http://files.keithlienert.com/uploads/1/3/1/6/131636914/3208263.pdf
    • http://files.reefencounters.org/uploads/1/3/1/3/131379042/mepakujef.pdf
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/vanimekabunopove.pdf
    • https://cdn.shopify.com/s/files/1/0430/2507/2282/files/nightjohn_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/4478/9669/files/beden_dili_oku.pdf
    • https://cdn.shopify.com/s/files/1/0446/2844/3299/files/i_am_a_warrior_song.pdf
    • https://cdn.shopify.com/s/files/1/0435/4146/3189/files/tarasogewovodaki.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/zupawet.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0418/files/98489265527.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4328/files/44610165553.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/libidurekatomanazavevufi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8992/9116/files/53031804738.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/90000814408.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0087/files/92809693843.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d81.bin
ddb120c9ffb70c8b1f8bb594fed5ec9992b28e3ccd0633929bb490d71a5d6325		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D81 5736 bytes
font_01_sfnt_off000090e1.bin
8795cdcb6b94e6ba1e6f9d50ede05a7f1ce6468515b6a347e96a3992a62d2799		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90E1 15848 bytes
font_02_sfnt_off0000c2f4.bin
18d666397a66ac242b850956d18ba33b32d376374abf608e9b57c1a0da462306		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F4 16236 bytes

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