Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f1ac835bfbb044…

MALICIOUS

PDF

45.9 KB Created: 2020-08-13 13:40:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb47b8154935ad06f4ed295f4867e13a SHA-1: 3ab8f569835a3a5c1c428150fdc8ff1a5639f991 SHA-256: 88f1ac835bfbb044555ef6f60defac8e7830e0c6f6a6fde7e1d0534e7b5c809d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, many of which are hosted on Shopify, suggesting a link farm for SEO poisoning. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/wb?keyword=problems%20for%20biomedical%20fluid%20mechanics%20and%20transport%20phenomena%20solutions%20pdf'. The document body, though malformed, contains text related to the URL's keyword, indicating a lure. The ML classifier strongly flagged this PDF as malicious.

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.com/wb?keyword=problems%20for%20biomedical%20fluid%20mechanics%20and%20transport%20phenomena%20solutions%20pdf
    • http://files.themillercompany.net/uploads/1/3/1/0/131070173/7500719.pdf
    • http://files.nancywijnants.com/uploads/1/3/0/7/130775368/ranurabusozogodogoti.pdf
    • http://nuluvu.empaonline.org/uploads/1/3/1/4/131483147/bovejemu-notejasepafa-vuzijiset.pdf
    • http://files.vcssc.ca/uploads/1/3/0/7/130739132/kubut-vopufa-liduve-tuvanuj.pdf
    • http://files.keenforgreenclonmel.com/uploads/1/3/1/4/131406935/vetab.pdf
    • https://cdn.shopify.com/s/files/1/0430/9303/3111/files/91264173558.pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3701/files/38716252213.pdf
    • https://cdn.shopify.com/s/files/1/0434/3247/6838/files/pudokenuxamu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1123/4197/files/1493952741.pdf
    • https://cdn.shopify.com/s/files/1/0435/1157/8776/files/80894968261.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/76829242547.pdf
    • https://cdn.shopify.com/s/files/1/0437/4292/0869/files/nazusadinemenodu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2505/5389/files/bomazefusoludejusikuvezu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2341/8019/files/vipemotokaxiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0427/files/kosaxogu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0961/2712/files/tupac_bury_me_ag.pdf
    • https://cdn.shopify.com/s/files/1/0437/9761/0657/files/48055747193.pdf
    • https://cdn.shopify.com/s/files/1/0434/8729/7696/files/bunobawakifuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40323832667.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_off000065cd.bin
f292cd465d8c8d0b5fce1b762bfbc92e9aefa480a4116f81b0dea8dce546368e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65CD 5420 bytes
font_01_sfnt_off00007800.bin
64451223a585b7d9f4c3271b322b4b56393df78034b5e8700a40a54124371808		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7800 10396 bytes
font_02_sfnt_off00009b7f.bin
8405bb6ca9a6fb718a2e910e1cdde4d74ac2122cab0061dc5f772322db9c7ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B7F 4324 bytes

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