Malicious PDF — malware analysis report

Static analysis result for SHA-256 84091461045efc7e…

MALICIOUS

PDF

43.0 KB Created: 2020-08-11 04:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 359a14f8c5235d0f7115fb61348e0069 SHA-1: 5f7b8a540dc584aa24ca044a5d03ce7b53866c12 SHA-256: 84091461045efc7edd3f299c253271e213bd33fe2d04b3753e9906f8d8f808ca
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. Another critical heuristic identified a PDF link farm, suggesting a tactic to artificially inflate search engine rankings. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of outbound links, including one pointing to a malicious redirector, strongly suggests an attempt to lure users to malicious sites or manipulate search results.

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=basic+biochemistry+questions+and+answers+pdf
    • http://files.ehheerunner.com/uploads/1/3/1/8/131857983/1315ec458de.pdf
    • http://files.gareiswelding.com/uploads/1/3/1/3/131379219/fatumunat-figuzivix-xovitavejib.pdf
    • http://files.newmorningacres.com/uploads/1/3/2/6/132680962/fitusemef-mifuzejonaxif-limagawebavupo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6785/8334/files/12874883401.pdf
    • https://cdn.shopify.com/s/files/1/0434/3929/2582/files/calendario_laboral_2020_catalua.pdf
    • https://cdn.shopify.com/s/files/1/0429/5570/2425/files/tuzedudolirezegawikifesom.pdf
    • https://cdn.shopify.com/s/files/1/0430/7746/8327/files/rofapa.pdf
    • https://cdn.shopify.com/s/files/1/0433/5557/0341/files/jegakolivaxikizegexemeta.pdf
    • https://cdn.shopify.com/s/files/1/0430/4375/0049/files/tigogaxinowuja.pdf
    • https://cdn.shopify.com/s/files/1/0430/4742/0066/files/91218838459.pdf
    • https://cdn.shopify.com/s/files/1/0433/6638/3768/files/donosigedulonewobota.pdf
    • https://cdn.shopify.com/s/files/1/0436/5529/9237/files/vokifase.pdf
    • https://cdn.shopify.com/s/files/1/0434/9408/0677/files/fuwilutitazefolapogipi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9760/files/durodejaxil.pdf
    • https://cdn.shopify.com/s/files/1/0436/4759/8742/files/91343085727.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_off000067a2.bin
be6eccdb6ce6a30913b4be1218171d4d790aa5ec2cd6d2126f63cad3cb39aec8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67A2 5872 bytes
font_01_sfnt_off00007b7e.bin
f75098269aae99b4f0a366efbfe0acbdd08a3356e24df32d2eee10a191d4ced0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B7E 10524 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.