Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f440375909a9fe…

MALICIOUS

PDF

45.0 KB Created: 2020-09-03 09:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2268fffccb5e1c9062fbf1bdc1eac38f SHA-1: d26b919297e48129800c49b9eb7452525af8ceef SHA-256: e5f440375909a9fe3616131543392cf30dce29531ec68c9d66202b988f8768d3
154 Risk Score

Malware Insights

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

This PDF document contains a mass external PDF link farm, with a primary malicious redirector link to 'https://ttraff.me/pify?keyword=speaking+ielts+test+format'. The document body, though heavily obfuscated, also contains this URL, suggesting the intent is to lure the user to click on it. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector.

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/pify?keyword=speaking+ielts+test+format
    • https://cdn.shopify.com/s/files/1/0434/1602/7303/files/vetadavu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/57299011341.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ruketisoren.pdf
    • https://cdn.shopify.com/s/files/1/0435/2180/2392/files/27452260862.pdf
    • https://cdn.shopify.com/s/files/1/0428/8295/7478/files/zokoguwozuxivexuzu.pdf
    • https://static.usrfiles.com/ugd/9c0842_dd472afbbc7b45b2ba4337a263690f9a.pdf
    • https://static.usrfiles.com/ugd/8d57bd_a04e6c592f3f4cc89194ae935ea561c1.pdf
    • https://static.usrfiles.com/ugd/8b49c6_d1f03d588b8e4a1aa8dfb08b9c3e3003.pdf
    • https://cdn.shopify.com/s/files/1/0438/5013/7760/files/53870503169.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/55611712960.pdf
    • https://cdn.shopify.com/s/files/1/0428/1607/7991/files/19595719080.pdf
    • https://cdn.shopify.com/s/files/1/0430/6331/2535/files/halogen_derivatives_of_alkanes_and_arenes_mcq.pdf
    • https://static.usrfiles.com/ugd/368de4_781eb20f42364641829effbd506b0825.pdf
    • https://static.usrfiles.com/ugd/f84671_356d3e4608d14fcabe910e296385ed22.pdf
    • https://static.usrfiles.com/ugd/9c58c5_b06202f50acd466f9a22fbb5b01f1cc8.pdf
    • https://static.usrfiles.com/ugd/51c472_e233c79d52e349c89d7e465e4161bfde.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_off000072ec.bin
c2fee7923adb9beb30f0ed6871c2f03768f2984404b5d1c5175fa5a459dbf7fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x72EC 5388 bytes
font_01_sfnt_off0000852e.bin
4e08afa089b27d86ba40f32177a021702d93f2548b4cb3310cceb9775c4cd9e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x852E 9908 bytes