Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7fb77f6954c024f…

MALICIOUS

PDF

42.2 KB Created: 2020-08-21 09:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 354ab4f306acae882670ca9fae91697a SHA-1: b6770a973b42c44234bf962f7b83c7d768e47d56 SHA-256: e7fb77f6954c024fceb2de19758dc2accdbb94031558d3466763a5c8aebf271d
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits a PDF link farm with numerous external links, including one to 'cdn.shopify.com' and another to 'files.krecklaugermanshorthairs.com'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to direct users to potentially harmful content.

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=tower+label+templates+word+2010
    • http://files.krecklaugermanshorthairs.com/uploads/1/3/0/9/130968993/ripev_vodikamutas_nukugiradegoni_fatefifoso.pdf
    • https://cdn.shopify.com/s/files/1/0429/7474/0636/files/zilexatijibogulodadofujox.pdf
    • https://cdn.shopify.com/s/files/1/0433/7228/2008/files/94967634817.pdf
    • https://cdn.shopify.com/s/files/1/0428/6906/3836/files/35720773498.pdf
    • https://cdn.shopify.com/s/files/1/0429/8647/1587/files/72903069115.pdf
    • https://cdn.shopify.com/s/files/1/0432/7928/6428/files/rujidu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8196/files/41239405238.pdf
    • https://cdn.shopify.com/s/files/1/0435/7318/2625/files/aranjuez_guitar_part.pdf
    • https://cdn.shopify.com/s/files/1/0437/6900/4190/files/74412134267.pdf
    • https://cdn.shopify.com/s/files/1/0430/1471/7597/files/mercedes_clk_2016.pdf
    • https://cdn.shopify.com/s/files/1/0440/9887/9640/files/59897579918.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_off0000668a.bin
47e1604c2cad59116db798c743f755ce19d0516e64e835fc959755500af53cb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x668A 5612 bytes
font_01_sfnt_off0000799f.bin
3127f474181cbec3f8847d02a4ea1cc4ce4372cf1ee88f582b399edfcc0f32ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x799F 10172 bytes