Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba38b47e8d6f2aaa…

MALICIOUS

PDF

51.6 KB Created: 2020-09-08 22:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c65bb1905a2b6b3267023ff65762ed20 SHA-1: 0a0495c28a1b1081fcd3536e37af4b1d681594f0 SHA-256: ba38b47e8d6f2aaa71ba90812e21be41d09a39ef4e13a0aa33420ab603dcdd27
152 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a known malicious domain, ttraff.me. This domain is used to serve a lure related to a movie song download, indicating a phishing or social engineering attempt. The PDF also contains a large number of embedded links, many pointing to static.usrfiles.com, which is flagged as a link farm. The ML classifier strongly indicated 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/pify?keyword=kashi+kannada+movie+audio+song
    • https://static.usrfiles.com/ugd/f0b6b3_625c75a6e1e14389989ec0a207281da2.pdf
    • https://static.usrfiles.com/ugd/d54300_c3e0c228cdd6482dadff432c07180c0e.pdf
    • https://static.usrfiles.com/ugd/c75f60_e84689c3dc03475bb610eb5356e67ea7.pdf
    • https://static.usrfiles.com/ugd/429b25_ad83f976fb35449dad3f721c3b5c433f.pdf
    • https://cdn.shopify.com/s/files/1/0428/8898/6783/files/rapefeba.pdf
    • https://cdn.shopify.com/s/files/1/0438/8087/4139/files/goxegadibobujuganupebiw.pdf
    • https://cdn.shopify.com/s/files/1/0432/5271/1581/files/segavixez.pdf
    • https://cdn.shopify.com/s/files/1/0434/4024/2840/files/dilatenorasakukazubamipib.pdf
    • https://cdn.shopify.com/s/files/1/0436/0273/9363/files/50683311614.pdf
    • https://cdn.shopify.com/s/files/1/0428/8777/4374/files/laporan_titrasi_kompleksometri.pdf
    • https://cdn.shopify.com/s/files/1/0438/0544/2209/files/rubik_s_cube_solution_guide_printable.pdf
    • https://static.usrfiles.com/ugd/b8c837_8074e4e6fb15479d8a3e200b9c09d4bb.pdf
    • https://static.usrfiles.com/ugd/590778_ea5531ff91a144618b9725641ed890db.pdf
    • https://static.usrfiles.com/ugd/078c79_dd757419a9c44da19c54dcd9514c91ac.pdf
    • https://static.usrfiles.com/ugd/d954c5_1479b9e89a1249c18b8275d1d1d84846.pdf
    • https://static.usrfiles.com/ugd/8b4172_70bc87fdfd0346259eb81effb06ae4d6.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_off000083b3.bin
8a97998684a767fe00d939b25b4f76042b6ad374c6050949ef9c7400dd9581f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x83B3 5204 bytes
font_01_sfnt_off0000954d.bin
ff88f98baad1ab547d12f6462ff3638a29b3507660c9efd3895038a4c44eb384
pdf-font-stream PDF embedded font (sfnt) at offset 0x954D 14088 bytes