Malicious PDF — malware analysis report

Static analysis result for SHA-256 342438ea3af4afe6…

MALICIOUS

PDF

48.9 KB Created: 2020-08-06 23:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 041debe824abbc3547afed69c78547e6 SHA-1: 23e80222a3f467c0232651dd5a7e70a5d2136e7c SHA-256: 342438ea3af4afe6778eb1cecfd30445135d918325994b29e1e75d8c558c543a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a mass of external links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=learning+english+grammar+book+pdf', which is flagged as a malicious redirector. This suggests the document is designed to lead users to malicious sites, likely for further exploitation or phishing.

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=learning+english+grammar+book+pdf
    • http://files.ndsportschannel.net/uploads/1/3/2/6/132681303/8bb736d63e2838.pdf
    • http://files.togetheractnow.org/uploads/1/3/1/4/131438439/0f9a143.pdf
    • http://files.riverqueengreens.com/uploads/1/3/1/6/131606343/wewamu.pdf
    • http://files.azprint115.com/uploads/1/3/2/7/132740723/tuxusasuluwagek_kuxiwatad_jegowuterijifid_ratidaravez.pdf
    • http://files.rdasoutheast.org/uploads/1/3/0/9/130969761/8187442.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/3865/2069/files/nugovixafikizuviberiwa.pdf
    • https://cdn.shopify.com/s/files/1/0434/6665/3858/files/48839457863.pdf
    • https://cdn.shopify.com/s/files/1/0432/0532/9064/files/3792929372.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/kezojomavoderigetamibe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7370/7925/files/tewib.pdf
    • https://cdn.shopify.com/s/files/1/0437/2417/7557/files/dubofudajizagizigusipipef.pdf
    • https://cdn.shopify.com/s/files/1/0436/6788/2134/files/jevevurebodenup.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0401/files/32172063197.pdf
    • https://cdn.shopify.com/s/files/1/0431/0623/8613/files/agamemnon_story.pdf
    • https://cdn.shopify.com/s/files/1/0435/5486/5320/files/rumuzukidi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sebifoxof.pdf
    • https://cdn.shopify.com/s/files/1/0428/5172/9567/files/dilulopufogusarisejen.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_off00007fcd.bin
f2a5b9b35320e37dba7099b93186d7eb62e72b048b40eeff6217f78c9690460e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FCD 5600 bytes
font_01_sfnt_off000092ac.bin
6c8af113302b8a83f05898a598868aacdd63786fa3a1a4b83d8276dd241a26ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92AC 10468 bytes

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