Malicious PDF — malware analysis report

Static analysis result for SHA-256 b477bb85e98dafa4…

MALICIOUS

PDF

46.4 KB Created: 2020-08-09 18:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb5d9dcbf6a707f59adf9fad5664991c SHA-1: 84fe901f6b62859a7998bb0e33b849d8b00f09f4 SHA-256: b477bb85e98dafa4a634555fe1024167a10f92fefc73ab316e8b9c6825acd97c
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a 'Certificado medico oficial pdf argentina'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same URL, reinforcing the lure. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites.

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=certificado+medico+oficial+pdf+argentina
    • http://files.nightsongpettingzoo.com/uploads/1/3/2/6/132681916/ninikidowemitufor.pdf
    • http://files.cancercantkilllove.com/uploads/1/3/0/8/130814208/7896015.pdf
    • http://files.alldogstoronto.com/uploads/1/3/0/8/130874394/tefow_vopuwipeb_degufuxedopu_fukebividek.pdf
    • http://files.ehsfluidpower.com/uploads/1/3/1/6/131607054/meloleno.pdf
    • http://files.nightsongpettingzoo.com/uploads/1/3/2/6/13268191
    • https://cdn.shopify.com/s/files/1/0428/2132/0870/files/71359898339.pdf
    • https://cdn.shopify.com/s/files/1/0430/1553/6793/files/76725701541.pdf
    • https://cdn.shopify.com/s/files/1/0446/7677/6089/files/wabifininirojudesuw.pdf
    • http://files.lkong.people.ua.edu/uploads/1/3/1/6/131636819/c2e358ec.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1413/files/74009710076.pdf
    • https://cdn.shopify.com/s/files/1/0431/6050/2421/files/regafapavafagalu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/201823564.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99914628395.pdf
    • https://cdn.shopify.com/s/files/1/0428/9986/5756/files/john_owen_the_doctrine_of_justification_by_faith.pdf
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/mosofopotidemesakudunapi.pdf
    • https://cdn.shopify.com/s/files/1/0447/5292/8919/files/hexadecimal_to_decimal_transparent.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/63032467643.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_off000076a0.bin
144d7656350f6061bbfc04d61ae306a837510d89dc4078c83b9a69685881772c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A0 5204 bytes
font_01_sfnt_off0000883d.bin
0cf275670580c495f58e06adc38501a3b03af243c4a5e88a6c49915c764569c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x883D 11188 bytes

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