Malicious PDF — malware analysis report

Static analysis result for SHA-256 c637f375bf4fdc48…

MALICIOUS

PDF

43.6 KB Created: 2020-08-10 10:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 160682a1c93f220b9fbdf541c60ada26 SHA-1: 4a79000bc624e16e7b99d260330e4eddf55b2fce SHA-256: c637f375bf4fdc489fe2b597a30ff9b1d6fd3541577d8349a9254bc6c471483f
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL, https://ttraff.ru/pify?keyword=android+studio+tutorial+pdf+indonesia, is designed to lure users into clicking, likely leading to a phishing or malware download site. The document body, though heavily obfuscated, contains this URL and other links pointing to potentially malicious infrastructure.

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=android+studio+tutorial+pdf+indonesia
    • http://dosaxijev.ultraexteriors.net/uploads/1/3/0/7/130775672/tijinavuduwidirew.pdf
    • http://files.councilreporter.com/uploads/1/3/1/3/131380042/5630754.pdf
    • http://jekepijex.world-magician.com/uploads/1/3/1/3/131379732/gebepirinomo-tidaputut-neped.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/golasabigizejusudavijitu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1246/4550/files/6th_grade_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/1339/7924/files/two_word_countries.pdf
    • https://cdn.shopify.com/s/files/1/0432/2649/7182/files/48954135387.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/rasomosefadosove.pdf
    • https://cdn.shopify.com/s/files/1/0428/9213/2508/files/2199411604.pdf
    • https://cdn.shopify.com/s/files/1/0436/0136/3107/files/77323748605.pdf
    • https://cdn.shopify.com/s/files/1/0429/2935/6959/files/52038100743.pdf
    • https://cdn.shopify.com/s/files/1/0439/1757/4299/files/advanced_technologies_for_intelligent_transportation_systems.pdf
    • https://cdn.shopify.com/s/files/1/0434/4122/5880/files/security_deposit_receipt.pdf
    • https://cdn.shopify.com/s/files/1/0433/2653/7883/files/jukese.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_off0000601f.bin
a96a8bd762f9209ffc2b081b0f28e2aa69822fbc5d8a025175e94611dc3c0e99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x601F 4908 bytes
font_01_sfnt_off000070d8.bin
02d21a6fd1317bd579ab1a9ccc3419fd8ba9c894095219cd742ac0ff03a85d52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70D8 10128 bytes
font_02_sfnt_off00009398.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9398 4324 bytes

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