Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2150d8a439c0edf…

MALICIOUS

PDF

39.5 KB Created: 2020-10-16 16:39:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0b3a3415f27c7cec7fc14e20c0e01fd SHA-1: 12058d0af988ea50f58b405a72237ae3c89d9f73 SHA-256: a2150d8a439c0edf18891ad28dafeae58a5b9322e6f2eb7a79c77ea81b0b9fb1
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to the linked URL, suggesting a lure to a malicious site. The presence of a link farm further indicates an attempt to distribute malicious content.

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/123?keyword=normative+influences+on+impulsive+buying+behavior+pdf
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5f8735c23fd69.pdf
    • https://cdn-cms.f-static.net/uploads/4369506/normal_5f882a199e350.pdf
    • https://cdn-cms.f-static.net/uploads/4367680/normal_5f89403d61446.pdf
    • https://sakuvajavabese.weebly.com/uploads/1/3/1/3/131383602/mewutijufebosura.pdf
    • https://cdn-cms.f-static.net/uploads/4374698/normal_5f89526e95c22.pdf
    • https://cdn-cms.f-static.net/uploads/4368221/normal_5f892b5d0a86b.pdf
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f8758055755a.pdf
    • https://cdn-cms.f-static.net/uploads/4368977/normal_5f893262eca4f.pdf
    • https://cdn-cms.f-static.net/uploads/4367922/normal_5f875d1ba21ae.pdf
    • https://cdn.shopify.com/s/files/1/0432/6791/5936/files/messenger_apk_uptodown.pdf
    • https://cdn.shopify.com/s/files/1/0436/0670/4290/files/66922854763.pdf
    • https://uploads.strikinglycdn.com/files/034d7b34-0678-469a-9552-efe1867cb2c1/murezewezafidubevabumuzox.pdf
    • https://uploads.strikinglycdn.com/files/5ad3ce14-f518-48cf-98bb-d90a6490698d/pakeriv.pdf
    • https://uploads.strikinglycdn.com/files/69b2a38e-af36-47cf-bedf-59047d83c5c9/77587384094.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_off00005ba1.bin
2b2e68eee3820d9192839d1d94629404b2c2e14e93fad6222f9f58cf6126251f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA1 5840 bytes
font_01_sfnt_off00006f5d.bin
caabc0e0a56a1752751b68c644613b7a337ac72ed5b6cbfbe43828d2100d6185
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F5D 9676 bytes