Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9404708a8de3f00…

MALICIOUS

PDF

45.7 KB Created: 2020-08-21 04:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26d26c884d871d244ae821f6634761d1 SHA-1: b1a603f0625429d097bac024e5cebb43d61ac053 SHA-256: e9404708a8de3f00b8d28c0b7e16850534e36a19d6df75a277b23ab2e5a75adf
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=chess+game+3ds+max+free'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to improve search engine visibility for the malicious content. No scripts were extracted, but the document body and heuristics strongly suggest a phishing or redirection attack.

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=chess+game+3ds+max+free
    • http://files.ftmpevents.com/uploads/1/3/1/1/131163949/xarawenirumasinu.pdf
    • http://files.desert-rose-productions.com/uploads/1/3/2/6/132681296/podugutebogus_pepinepa_juvubisolifixi_kigijifafu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5604/files/76602947070.pdf
    • https://cdn.shopify.com/s/files/1/0435/7901/5327/files/kubota_l45_for_sale.pdf
    • https://cdn.shopify.com/s/files/1/0440/6794/6648/files/8220583819.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/93892521761.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4182/files/didevu.pdf
    • https://cdn.shopify.com/s/files/1/0439/4457/5144/files/90144602103.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/algorithm_analysis_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/2885/6477/files/51585561457.pdf
    • https://cdn.shopify.com/s/files/1/0430/0003/7527/files/95638573209.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57790570823.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9054/files/fepapopugefomisajut.pdf
    • https://cdn.shopify.com/s/files/1/0433/6697/3589/files/68527248523.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_off00006873.bin
0033e2dfde899a52f64234efc28cf91c3b70c7da55f77c176912d0a4248c3622		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6873 4988 bytes
font_01_sfnt_off00007963.bin
5c409ec4a9189da8f6a913a15bf3507a1d6076c5bf7995db66a0e746486c2430		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7963 10120 bytes
font_02_sfnt_off00009bf4.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BF4 4324 bytes

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