Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc4e7517181253e…

MALICIOUS

PDF

43.4 KB Created: 2020-08-10 07:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d420f399c95e4076fad3dfa9b787fdb0 SHA-1: 738a3cbc3df57dcf895ddd608f3ebefe37d60cb7 SHA-256: 3fc4e7517181253e5cf2c879a0113ee2322ddcf57a07b9628856bc70da72a2b1
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.ru/pify?keyword=descriptive+study+meaning+pdf'. Another critical heuristic identified a PDF link farm, suggesting a tactic to artificially inflate search engine rankings or distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF. The document body, though partially corrupted, contains text related to 'Descriptive study meaning pdf' and the malicious URL, reinforcing the lure.

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=descriptive+study+meaning+pdf
    • http://files.santarosaneighborhoodcoalition.com/uploads/1/3/0/7/130775257/kiwog.pdf
    • http://files.jackalopehq.com/uploads/1/3/1/0/131070581/6330634.pdf
    • http://files.silentmanfilm.com/uploads/1/3/1/3/131398447/xalefu_widepolarisawok_binemimowureje_daxuji.pdf
    • http://files.gardenclubbathohio.org/uploads/1/3/1/8/131871602/jineka.pdf
    • https://cdn.shopify.com/s/files/1/0435/7983/4531/files/reversed_phase_chromatography.pdf
    • https://cdn.shopify.com/s/files/1/0440/4035/6005/files/tuwebadusivulifikuxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/80804151078.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9525543421.pdf
    • https://cdn.shopify.com/s/files/1/0433/9430/2117/files/xuminufunexulunejimop.pdf
    • https://cdn.shopify.com/s/files/1/0433/1637/9816/files/3220483039.pdf
    • https://cdn.shopify.com/s/files/1/0437/1637/8773/files/mathematical_formulas_for_competitive_exams.pdf
    • https://cdn.shopify.com/s/files/1/0428/5677/5839/files/90910151872.pdf
    • https://cdn.shopify.com/s/files/1/0435/1547/8176/files/vukekawel.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tusag.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_off00006bc5.bin
68aff799fe7c01193f8b6d866a829bec60d4ba0c9cfd0f33de716a5538a19a60
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC5 5604 bytes
font_01_sfnt_off00007ed4.bin
acc30ec0f2555c47648798f929aa89d1463e00358869384b39196bfd8e3cf6f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED4 9988 bytes