Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a77f15834285221…

MALICIOUS

PDF

65.2 KB Created: 2020-08-07 22:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e85a2d19e0619b2aa109c0cdcf1e404a SHA-1: 680095922eb0f5ff5abadeecf8dac60efd5fde42 SHA-256: 5a77f15834285221c024f44f713a8e24b43f19514f1e62726aff11d24e37f6d6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://ttraff.ru/pify?keyword=caperucita+roja+cuento+original+pdf'. It also exhibits characteristics of a PDF SEO link farm, embedding numerous external PDF links, many of which are hosted on Shopify. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. The document body, though heavily obfuscated, contains the same redirector URL and several other PDF links, reinforcing the lure.

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=caperucita+roja+cuento+original+pdf
    • http://files.encroixdanceacademy.com/uploads/1/3/1/3/131380171/3490625.pdf
    • http://files.3blossomscafe.com/uploads/1/3/1/4/131453904/gituragogan.pdf
    • http://perisaze.counseling4allseasons.com/uploads/1/3/1/6/131606758/pixosoxu-fajotejelisa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7365/0334/files/calderas_acuotubulares_caracteristicas.pdf
    • https://cdn.shopify.com/s/files/1/0430/4925/5061/files/62699037076.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8099/files/tekenenod.pdf
    • https://cdn.shopify.com/s/files/1/0431/7193/8461/files/79634413496.pdf
    • https://cdn.shopify.com/s/files/1/0430/4899/2930/files/83586533040.pdf
    • https://cdn.shopify.com/s/files/1/0439/6302/3518/files/16637939228.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/26301320407.pdf
    • https://cdn.shopify.com/s/files/1/0428/6801/5260/files/vapifu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20597849085.pdf
    • https://cdn.shopify.com/s/files/1/0438/4443/6128/files/vovavajugen.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/78433368173.pdf
    • https://cdn.shopify.com/s/files/1/0439/3612/0990/files/artificial_neural_network_example.pdf
    • https://cdn.shopify.com/s/files/1/0437/2581/5959/files/revuwiregasil.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c33f.bin
8d1a78e6c33664bd97578e0a32d1f0e7ce5bfe2708ac4b904c82c5dc18d66146		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC33F 5128 bytes
font_01_sfnt_off0000d4c4.bin
aec4512503fc6230504cd653355d7676f564ef1e198bdb1b8635ef749fa61b77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C4 10400 bytes

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