Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe58990ae1fb7382…

MALICIOUS

PDF

41.5 KB Created: 2020-08-31 17:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eec8e959581e5c3dd6dba700e45381df SHA-1: 440d0903b8378c56a22b96ba67c44910d5b6e1bd SHA-256: fe58990ae1fb73821ee024f52d1f98fb1ecf241fbf03dcb9add6ad9bca50e84a
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=braun+thermoscan+6013+user+manual'. This URL is embedded within the document body, disguised as a user manual. The presence of a large number of external PDF links, many pointing to Shopify domains, suggests a link farm designed to obscure the malicious redirector. 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.cc/wix?keyword=braun+thermoscan+6013+user+manual
    • https://static.usrfiles.com/ugd/b8c837_c283785eeb7249c19aeaa88ad8b05c3e.pdf
    • https://static.usrfiles.com/ugd/cc089a_82a618234eb8445982f52cc0c4a52a8e.pdf
    • https://static.usrfiles.com/ugd/15d534_764dd1dd554b47029abc9800cbbadc48.pdf
    • https://static.usrfiles.com/ugd/b8c837_27a1d5dae6d6492e9c161aa61f94b069.pdf
    • https://cdn.shopify.com/s/files/1/0430/5318/7223/files/shazam_app_mac.pdf
    • https://cdn.shopify.com/s/files/1/0436/2862/6080/files/vemuju.pdf
    • https://cdn.shopify.com/s/files/1/0430/4335/6821/files/95666167851.pdf
    • https://cdn.shopify.com/s/files/1/0430/0872/1045/files/chugoku_electric_power_company_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0437/7024/9374/files/76847196235.pdf
    • https://static.usrfiles.com/ugd/b8c837_4e3537f3090f4edbaf929c0d4e6f02a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_796876de88fd40fba1d728efb3eaeb1d.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/25494760100.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/roresetozo.pdf
    • https://cdn.shopify.com/s/files/1/0462/4138/2560/files/adding_and_subtracting_rational_numbers_worksheet.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_off00006154.bin
323056521706be84b3629095b748982fbbd5d728131c1863077b5db55343ba27
pdf-font-stream PDF embedded font (sfnt) at offset 0x6154 5600 bytes
font_01_sfnt_off0000742d.bin
855095b5d6b5e110be549b487ebcb28438880e3ba480a9beccaf7d6e17486e1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x742D 10488 bytes