Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be3da4ea9fdd82a…

MALICIOUS

PDF

43.9 KB Created: 2020-08-04 00:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef0b62563d4507974095507051bfbf0c SHA-1: 982d6187f605f2dd61f8579f06db143d868557f4 SHA-256: 7be3da4ea9fdd82af7f0740fcf59b3642e323b320f00efdbb211aaf163fc7105
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=3d+printing+and+additive+manufacturing+technologies+pdf. The document body, though heavily obfuscated, also contains this URL and other links hosted on various domains, suggesting a link farm or redirection scheme. The ML classifier strongly supports the malicious nature of this PDF.

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=3d+printing+and+additive+manufacturing+technologies+pdf
    • http://files.ollivlogs.com/uploads/1/3/0/7/130775970/lovidizosavo_vosevufanovog_rifavebada_towafedidoke.pdf
    • http://files.chestnuthillonline.org/uploads/1/3/0/7/130775734/61745659f.pdf
    • http://files.drivenfundraising.com/uploads/1/3/0/7/130738876/lijewaporetuvenidas.pdf
    • http://files.samsaraholidayhouse.com/uploads/1/3/1/8/131857756/biwenijuwesuzi-kobonaredapir-gexodetopama.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22511335110.pdf
    • https://cdn.shopify.com/s/files/1/0431/2819/3184/files/xifaxakeke.pdf
    • https://cdn.shopify.com/s/files/1/0435/1167/7083/files/chris_hemsworth_workout_plan.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/897830086.pdf
    • https://cdn.shopify.com/s/files/1/0436/3727/6825/files/napoleon_total_war_great_war_mod.pdf
    • https://cdn.shopify.com/s/files/1/0431/1157/9809/files/34137970474.pdf
    • https://cdn.shopify.com/s/files/1/0430/9060/8285/files/nogapafibonujulegus.pdf
    • https://cdn.shopify.com/s/files/1/0430/0167/5939/files/22135918390.pdf
    • https://cdn.shopify.com/s/files/1/0436/8862/4283/files/zamomasemokoje.pdf
    • https://cdn.shopify.com/s/files/1/0430/2385/9873/files/prey_neuromod_fabrication.pdf
    • https://cdn.shopify.com/s/files/1/0431/6053/5196/files/20564986816.pdf
    • https://cdn.shopify.com/s/files/1/0435/4850/8311/files/attitude_magazine_august_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/17418425376.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_off00006b48.bin
556449ea5a83f99c1b667562da0de86c6303dc514d96f4be31b52991594f9a99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B48 5700 bytes
font_01_sfnt_off00007e8d.bin
56bae83e8bedd83b04cc5169d2e1d6ad76a1d3683f6d012fc7ab49982f3d8043		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E8D 10400 bytes

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