Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42e5fcf98359fdd…

MALICIOUS

PDF

60.9 KB Created: 2020-08-23 17:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2b3e5c15666ba9d79b6fcac72229241 SHA-1: a9c5fc73667dd464d79a2e05a15a86410459a903 SHA-256: c42e5fcf98359fddd3da547ec7f557077b563455cec6aabe9533785f11172418
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The primary malicious indicator is the link to `ttraff.ru`, which is known to host redirectors. The document body contains garbled text but also includes the malicious URL, suggesting it's part of a lure.

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.ru/pify?keyword=bhairava+songs+tamil+free
    • http://tejix.moravianseminary.org/uploads/1/3/1/3/131383482/tolijixetas_lijeniga_nigapupere.pdf
    • https://cdn.shopify.com/s/files/1/0440/6516/1366/files/nijuxova.pdf
    • https://cdn.shopify.com/s/files/1/0437/0061/7381/files/lixitos.pdf
    • https://cdn.shopify.com/s/files/1/0463/9725/9931/files/front_desk_coordinator_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0439/2206/3515/files/next_bus_san_francisco_muni.pdf
    • https://cdn.shopify.com/s/files/1/0438/2903/5158/files/76860811501.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/jofesepugasopurodi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1021/9422/files/25658537929.pdf
    • https://cdn.shopify.com/s/files/1/0432/1440/5793/files/38047336750.pdf
    • https://cdn.shopify.com/s/files/1/0430/3169/1421/files/84086390421.pdf
    • https://cdn.shopify.com/s/files/1/0430/5027/0869/files/android_name_id_app.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81274949660.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4900/files/83103825530.pdf
    • https://cdn.shopify.com/s/files/1/0429/2670/2755/files/84244134962.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008dc5.bin
87cf09255e0e02e95a15f04ac64fb9f7e6d01992aed1dd6b7e1288f4923181e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC5 5288 bytes
font_01_sfnt_off00009f9d.bin
9fd0faff2c633ce044fe821c26e31afb9dc5f9a98e5bd728f0ad04e34439c3a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F9D 15384 bytes
font_02_sfnt_off0000cf6c.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6C 16204 bytes