Malicious PDF — malware analysis report

Static analysis result for SHA-256 263012cd0236b5f8…

MALICIOUS

PDF

44.9 KB Created: 2020-08-03 11:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d98c84a0804145e17a6f9fdf5957e20 SHA-1: 85863e5ce9b81c2f3374832e8e8c0127043f671d SHA-256: 263012cd0236b5f8fbef5bac716006e8497aa658ea40770f3c197110bd935b86
152 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 ttraff.ru. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of numerous other links to Shopify-hosted PDFs indicates a link farm strategy, likely for SEO poisoning to attract victims searching for study materials. 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=edexcel+a+level+biology+student+book+1+pdf
    • http://files.raschoolofexcellence.com/uploads/1/3/1/6/131636766/votosul.pdf
    • http://files.edenbridgehockeyclub.co.uk/uploads/1/3/1/4/131406321/a0049.pdf
    • http://files.michaeljaigrant.com/uploads/1/3/1/4/131407737/7082772.pdf
    • http://files.jspuccini.com/uploads/1/3/1/1/131164097/wuwofoji-nopuzenuxa.pdf
    • http://files.uwbcmn.org/uploads/1/3/1/4/131438692/7837089.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/94719214550.pdf
    • https://cdn.shopify.com/s/files/1/0430/6118/2617/files/87127543616.pdf
    • https://cdn.shopify.com/s/files/1/0429/7247/9647/files/voneledukukur.pdf
    • https://cdn.shopify.com/s/files/1/0428/8105/6935/files/39550622868.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/sugenibaxazobitejulosir.pdf
    • https://cdn.shopify.com/s/files/1/0434/0213/3656/files/tizezapoxevawufu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8315/3056/files/gifubixowezikuwunaxav.pdf
    • https://cdn.shopify.com/s/files/1/0434/8713/3860/files/katinabitesupal.pdf
    • https://cdn.shopify.com/s/files/1/0432/1512/6692/files/61144107222.pdf
    • https://cdn.shopify.com/s/files/1/0435/0155/1771/files/soduworumutepadokoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mekokagowofulagifofid.pdf
    • https://cdn.shopify.com/s/files/1/0435/1367/5928/files/renozafeteza.pdf
    • https://cdn.shopify.com/s/files/1/0430/5597/2505/files/46227493258.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071b8.bin
c4f417f39c26013c48f2cd98e37f7f966dfe20eb45d0f5eca96295bc15039cc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B8 5672 bytes
font_01_sfnt_off00008538.bin
01ea0c4ed711f63cf8bf65746d905973887e132c6afabc5aea18c31045d4d1a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8538 9752 bytes

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