Malicious PDF — malware analysis report

Static analysis result for SHA-256 edbbcb8a45f98939…

MALICIOUS

PDF

39.3 KB Created: 2020-09-06 17:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3425db95c9cfb1315f1ef4f5cfdace83 SHA-1: 1572412159f044687d52613d0ff8fec7d1715bf9 SHA-256: edbbcb8a45f98939b3d0041ac2b800795e5b62abc48eeb1d6ed962e721c24922
152 Risk Score

Malware Insights

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

The PDF file contains embedded links, one of which points to a known malicious redirector. The presence of numerous other links to Shopify-hosted PDFs suggests this is part of a link farm intended to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL.

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=chota+bheem+tamil+episode++hd
    • https://cdn.shopify.com/s/files/1/0434/3057/6285/files/ashcroft_and_mermin_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0430/3290/3829/files/nakes.pdf
    • https://cdn.shopify.com/s/files/1/0436/4464/9630/files/kodowusinuli.pdf
    • https://cdn.shopify.com/s/files/1/0435/8999/2616/files/approaches_to_international_compensation.pdf
    • https://cdn.shopify.com/s/files/1/0437/8905/8206/files/85852043594.pdf
    • https://cdn.shopify.com/s/files/1/0431/8950/2111/files/rotewapememazanekin.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/bncc_educao_fsica_2020.pdf
    • https://cdn.shopify.com/s/files/1/0449/5494/3643/files/nivilofimojemita.pdf
    • https://cdn.shopify.com/s/files/1/0440/5339/7654/files/94737405486.pdf
    • https://cdn.shopify.com/s/files/1/0430/7307/7415/files/68531972739.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3015/files/zalesofimedufuxudijo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9291/7924/files/blood_test_report.pdf
    • https://cdn.shopify.com/s/files/1/0429/4718/2759/files/pomazot.pdf
    • https://cdn.shopify.com/s/files/1/0438/8257/8088/files/mee6_delete_messages.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_off00004d2f.bin
e88ccb24ccacc302bd97a71e6f91dcfec7567ae586824d4c3cd8448189ece897
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D2F 4948 bytes
font_01_sfnt_off00005e01.bin
b6d002bb2654064fb0eb7aa89a00b7c5ed7dede3e0489d05cdf6b9d6082d1245
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E01 10900 bytes
font_02_sfnt_off0000828a.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0x828A 4324 bytes