Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a04117f545ee898…

MALICIOUS

PDF

41.4 KB Created: 2020-08-11 00:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6d5f98ea09acc2b4609523404b637f5 SHA-1: 69c50b1ddad3ea3f349a6a854efaf4c25f6c70fb SHA-256: 8a04117f545ee8988de6fef3d602e7d9587634a4a73f3992f53d579e789661a4
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a large number of embedded links, many pointing to external PDF files, indicating a potential link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body is heavily obfuscated, making it difficult to determine the exact user-facing 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=past+simple+vs+present+perfect+board+game+pdf
    • http://files.power4lifenow.com/uploads/1/3/2/7/132712225/6540855.pdf
    • http://jinibumo.claudyjohnmitchelsgac.com/uploads/1/3/2/7/132710797/4036862.pdf
    • http://rurosi.billyrocksphilly.com/uploads/1/3/0/9/130969060/lavumolonokibet.pdf
    • http://files.frio4jrivercamp.com/uploads/1/3/0/7/130776162/mugezajubegadenirali.pdf
    • http://files.waikikioutdoorcircle.org/uploads/1/3/1/4/131406604/vemewal.pdf
    • https://cdn.shopify.com/s/files/1/0429/1634/8057/files/tisutojawufidovexasobu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0508/3811/files/honeywell_6000_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/7929/5383/files/fujituvuwi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/41985397321.pdf
    • https://cdn.shopify.com/s/files/1/0430/6026/5117/files/73630289041.pdf
    • https://cdn.shopify.com/s/files/1/0434/1982/8386/files/4743321870.pdf
    • https://cdn.shopify.com/s/files/1/0431/7229/8913/files/61775971383.pdf
    • https://cdn.shopify.com/s/files/1/0430/6498/3703/files/dajotolilu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1021/2518/files/23780047912.pdf
    • https://cdn.shopify.com/s/files/1/0433/6225/5013/files/pokuwemebujabugukelitur.pdf
    • https://cdn.shopify.com/s/files/1/0429/4855/9004/files/ap_psychology_sensation_and_perception_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0436/9409/6539/files/fur_elise_sheet_music.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_off00006294.bin
2e3be886f1431b4b063eade2b7a8275f3387310ca63fa55dde914e6f494843ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6294 5676 bytes
font_01_sfnt_off000075c6.bin
38c43be7450fd9d9b27796d7e1231f5a8e9b24105f15b4cf1bb320a8ea3d8f3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75C6 10104 bytes

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