Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc728feed68a54c6…

MALICIOUS

PDF

47.3 KB Created: 2020-08-31 23:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5c1096a0dde83d0981fd691489851dd SHA-1: 2483b12580e0f3aa87a218fb7fbadd937b596609 SHA-256: bc728feed68a54c6db966a792846879f899cadbda407df103541f212213cf8b4
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to a 'civil service reviewer pdf with answer key' and the malicious URL, suggesting a lure. The presence of numerous external PDF links, many hosted on 'static.usrfiles.com', indicates a link farm designed to distribute malicious content or improve SEO for malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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=civil+service+reviewer+pdf+with+answer+key
    • https://static.usrfiles.com/ugd/bf650e_2c32eafa237043e3833ae5092c1963a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_52027d714b4c4b2d94a2f8793f2c9a8c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a51bde549a4b435ea3aabcaf1a2a355d.pdf
    • https://static.usrfiles.com/ugd/5a1791_426eebd43046461193998c7c07adf5a1.pdf
    • https://cdn.shopify.com/s/files/1/0428/4363/5879/files/craigslist_car_jackson_ms.pdf
    • https://cdn.shopify.com/s/files/1/0430/1979/6643/files/55905119768.pdf
    • https://cdn.shopify.com/s/files/1/0431/7252/8292/files/60538788620.pdf
    • https://cdn.shopify.com/s/files/1/0437/4691/8551/files/windows_10_update_media_creation_tool.pdf
    • https://cdn.shopify.com/s/files/1/0431/7223/3376/files/18811246260.pdf
    • https://cdn.shopify.com/s/files/1/0428/0382/2755/files/gadavegubugadapaveno.pdf
    • https://cdn.shopify.com/s/files/1/0438/0730/9984/files/2006_polaris_trailblazer_250_carburetor.pdf
    • https://static.usrfiles.com/ugd/b8c837_7902245d2bbc41298be85ada6cb43531.pdf
    • https://static.usrfiles.com/ugd/111c46_f039e79b4ac84f3c859ab4ce4f80153e.pdf
    • https://static.usrfiles.com/ugd/eb6612_cb57f7c3e5fa43ce9338af98627f466f.pdf
    • https://static.usrfiles.com/ugd/b48b60_8666c108b5c9448d97322403af50a477.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_off0000770b.bin
1a4e2398017a2711ad2f520c3650423b23becd99badc329506e8e1faf015afa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x770B 5468 bytes
font_01_sfnt_off000089b8.bin
b14f81bb0dc94a8a636c3720f46670350770e7c96d152c0fc555177248ba9671		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89B8 11528 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.