Malicious PDF — malware analysis report

Static analysis result for SHA-256 72dd7d16f9f56940…

MALICIOUS

PDF

46.1 KB Created: 2020-08-10 21:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cc8bed2ee800f415c15f8b380059d70 SHA-1: d9d334b73e1adcdd3735391d1ddb054fff040055 SHA-256: 72dd7d16f9f5694003ca3539b357ce392852c5f74f9a58471f2d8317a7b9b841
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary links, 'https://ttraff.ru/pify?keyword=arm+cortex+a8+architecture+pdf', is identified as a malicious redirector. This indicates the document's purpose is to direct users to potentially harmful content, likely for phishing or malware distribution.

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=arm+cortex+a8+architecture+pdf
    • http://files.mariepoza.com/uploads/1/3/0/8/130814900/sejipomavinem.pdf
    • http://files.andrehugosplace.com/uploads/1/3/0/8/130814921/933911b16640d4d.pdf
    • http://files.cjcbigband.org/uploads/1/3/1/8/131856919/a2cecc087.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/fewedofafigurulu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62856854762.pdf
    • https://cdn.shopify.com/s/files/1/0437/9456/3221/files/kamuga.pdf
    • https://cdn.shopify.com/s/files/1/0433/4731/2789/files/servo_voltage_stabilizer_working_principle.pdf
    • https://cdn.shopify.com/s/files/1/0430/9132/9173/files/golden_english_language_and_literature_class_10.pdf
    • https://cdn.shopify.com/s/files/1/0428/9573/6988/files/zoneddatetime_to_date.pdf
    • https://cdn.shopify.com/s/files/1/0431/2242/6013/files/wofujexekinuxojatoxodef.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/17907197669.pdf
    • https://cdn.shopify.com/s/files/1/0433/4003/8302/files/28246711686.pdf
    • https://cdn.shopify.com/s/files/1/0440/0375/4142/files/c_get_timestamp.pdf
    • https://cdn.shopify.com/s/files/1/0431/6112/5015/files/pofesi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4880/3227/files/albizia_adianthifolia.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5682/files/89820135315.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005de9.bin
df9eca8586b4b0d2f641f0c6f2aa0e86d4b4bf3e1cffab305bc0ff1ab5a716ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE9 5212 bytes
font_01_sfnt_off00006f9e.bin
879a4070dbd0ffc47c046c9ab1626974210be400fd47846404fcc02429fe8b28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9E 14828 bytes
font_02_sfnt_off00009d7d.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D7D 4324 bytes

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