Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f49de9175b4a682…

MALICIOUS

PDF

34.1 KB Created: 2020-08-24 00:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4e9badae46b3909c17429c63c28f3cb SHA-1: 20e8e8b28aa4c389e2330e4485e7a2648e99dca3 SHA-256: 7f49de9175b4a6821d86186969a87c16d8db251b42ea7fc7c27dbbd2f2bd370a
152 Risk Score

Malware Insights

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

The PDF contains a "malicious redirector link" and a "PDF SEO link farm" heuristic firing, indicating it's designed to drive traffic to malicious sites. The document body, though heavily obfuscated, contains text related to "Prentice Hall African American History PDF" and includes the primary malicious URL. The ML classifier also strongly flagged this PDF as malicious. The primary intent appears to be redirecting users to malicious content via the embedded links.

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.cc/pify?keyword=prentice+hall+african+american+history+pdf
    • http://vozotig.lisabuckpottery.com/uploads/1/3/0/7/130776257/2747831.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/wedegizifujiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/1308/7142/files/87361666089.pdf
    • https://cdn.shopify.com/s/files/1/0428/1230/9671/files/megikaxewonagafosavo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1891/9837/files/medical_certificate_format.pdf
    • https://cdn.shopify.com/s/files/1/0466/2309/6997/files/biblia_dios_habla_hoy_online.pdf
    • https://cdn.shopify.com/s/files/1/0432/9940/5979/files/lisabulebu.pdf
    • https://cdn.shopify.com/s/files/1/0438/3378/6525/files/lisananiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/2525/9944/files/nenekewedowijinamexutevek.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lafiku.pdf
    • https://cdn.shopify.com/s/files/1/0432/5376/0162/files/impractical_jokers_uk_tv_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5093/files/39719333134.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_off000045ab.bin
9dca6da0917b85b8e2a6d62c82f9f7e46ecc5a96554f9cb1e646317fef0b9c5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x45AB 5496 bytes
font_01_sfnt_off0000582b.bin
526865b8e11bdf61c2952b72232cb913fade8998f5937e2e0f67207ed1f072ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x582B 10340 bytes