Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c0f770a06afcca…

MALICIOUS

PDF

43.5 KB Created: 2020-08-18 21:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27e7320ef903a2b457b683f8762fff66 SHA-1: 2c4a804f1f701d08174252e92fd2d90106b53e3d SHA-256: d9c0f770a06afcca44697a8771b35cd850bda047ccac1e11cd77491a485d9bc0
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'ttraff.com', which is associated with a link farm heuristic. The document body, though heavily obfuscated, contains the same URL. This suggests the primary goal is to redirect users to a malicious site, likely for software piracy or to download unwanted programs, as indicated by the 'piriform free ccleaner' keyword in the URL.

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.com/pify?keyword=piriform+free++ccleaner
    • http://files.everyday-regalia.com/uploads/1/3/1/4/131407135/24c5776.pdf
    • https://cdn.shopify.com/s/files/1/0430/6364/0213/files/private_pilot_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1824/files/9491619933.pdf
    • https://cdn.shopify.com/s/files/1/0439/9369/4366/files/28321829094.pdf
    • https://cdn.shopify.com/s/files/1/0433/4285/6344/files/newupobilorarafujebuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/3015/1330/files/34103489193.pdf
    • https://cdn.shopify.com/s/files/1/0435/6875/8943/files/30272825309.pdf
    • https://cdn.shopify.com/s/files/1/0449/1496/6695/files/5032332355.pdf
    • https://cdn.shopify.com/s/files/1/0430/8477/5577/files/2074949614.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78214852322.pdf
    • https://cdn.shopify.com/s/files/1/0432/4042/3592/files/electronic_configuration_of_the_first_20_elements.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_off00006540.bin
ba2042cd1b187cbd4c6352d224e62435b447635963f8924cf61e5886337a6b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6540 4852 bytes
font_01_sfnt_off0000759d.bin
ffe63f5a059af61cec28e4cdd2ff89bfcb09497df68649016a98a934541e6095		 pdf-font-stream PDF embedded font (sfnt) at offset 0x759D 13964 bytes

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