Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f233cda37a1baff…

MALICIOUS

PDF

43.0 KB Created: 2020-09-02 20:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2bf5d8e9c78c15ef3d5aa2c34f5a46a SHA-1: e8c814eeffa91d51087a01be1201ca04a30c1c5c SHA-256: 3f233cda37a1baff88f80376a9fc6c5623b55228f78a8d80ae7f80bd72aef459
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDFs hosted on CDNs, which is indicative of a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.club/wix?keyword=cron+time+format+generator'. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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.club/wix?keyword=cron+time+format+generator
    • https://static.usrfiles.com/ugd/48d9a1_b77303ae9443432a88d1970eb67e3e3e.pdf
    • https://static.usrfiles.com/ugd/275374_879c2615a66249d78896fff79c026455.pdf
    • https://static.usrfiles.com/ugd/b371d9_0938a6e9e65c43e2bfb74272aa5b3b5c.pdf
    • https://static.usrfiles.com/ugd/0c60a0_856b7467979b4ae28ff02c219ff4067b.pdf
    • https://static.usrfiles.com/ugd/b8c837_2dba0c823b7a41fc9f1d03463ff52488.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89352644259.pdf
    • https://cdn.shopify.com/s/files/1/0434/3722/8188/files/cutting_edge_upper_intermediate_third_edition_workbook_with_key.pdf
    • https://cdn.shopify.com/s/files/1/0432/9432/6949/files/alternaria_brassicicola.pdf
    • https://cdn.shopify.com/s/files/1/0431/7108/6485/files/mefavasiwazixigasele.pdf
    • https://cdn.shopify.com/s/files/1/0431/5778/2690/files/60193927145.pdf
    • https://cdn.shopify.com/s/files/1/0431/3032/3101/files/pofenojo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7439/6065/files/50349363689.pdf
    • https://cdn.shopify.com/s/files/1/0434/3654/0069/files/anualidades_diferidas_formulas.pdf
    • https://cdn.shopify.com/s/files/1/0433/2650/5118/files/42117564577.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9467339244.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/99560932276.pdf
    • https://cdn.shopify.com/s/files/1/0431/4690/3709/files/xilivogabatavosudogivavu.pdf
    • https://cdn.shopify.com/s/files/1/0464/7996/6360/files/zifatisubij.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/
    • https://cdn.shopify.com/s/files/1/0464/799

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006461.bin
5afe290ed1de608b4ba06350f99499123a3068fa3eb3d7e4182ee164fa5bbc9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6461 4784 bytes
font_01_sfnt_off0000748b.bin
e7dbc05df6946eb79e0568f6f8ce983bd71732d6b87bf46f1d7bd3568be92a5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x748B 13180 bytes

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