Malicious PDF — malware analysis report

Static analysis result for SHA-256 a479be1b05f3701f…

MALICIOUS

PDF

40.0 KB Created: 2020-09-08 03:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c857f29855ccca9faf3ec4944c920e54 SHA-1: 500835282852910c4e19aa787bf09414d0728950 SHA-256: a479be1b05f3701fd087dd3731fc07aa10208b948e04375a42f4f544b6948f80
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector link to 'https://ttraff.me/wix?keyword=manual+back+spot+facing+tools'. The document body, though heavily obfuscated, also contains this URL and references to 'Manual back spot facing tools', suggesting a lure. The ML classifier strongly indicates maliciousness.

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.me/wix?keyword=manual+back+spot+facing+tools
    • https://static.usrfiles.com/ugd/1d64af_f50649ec863b46e18309877a17837d08.pdf
    • https://static.usrfiles.com/ugd/6da380_c5d6a719d009463b9594a7503ac39aba.pdf
    • https://static.usrfiles.com/ugd/85c99c_feb37210eb8844b3b04a33a6cf4ba969.pdf
    • https://cdn.shopify.com/s/files/1/0428/5782/4419/files/wifiwujagimate.pdf
    • https://cdn.shopify.com/s/files/1/0434/1802/6142/files/la_prose_du_transsibrien_analyse.pdf
    • https://cdn.shopify.com/s/files/1/0430/1671/6437/files/13178555122.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/mopopimisoraviwepofexupa.pdf
    • https://cdn.shopify.com/s/files/1/0435/0600/8216/files/anne_frank_diary_extract.pdf
    • https://cdn.shopify.com/s/files/1/0431/6620/4066/files/16007418232.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/fadas.pdf
    • https://cdn.shopify.com/s/files/1/0428/0451/0887/files/26956179393.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_off00005ea4.bin
707ffb08ef0efcfd9f6a3d6f9c33c1c44f3426a3b2bd484eed5af973a79e40c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA4 5296 bytes
font_01_sfnt_off000070d1.bin
9f776f730f6f49f3e8bae8c117118fefea9f9780853215ce05c13fe20c645116		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70D1 10228 bytes

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