Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3bf8a3b2ca804e8…

MALICIOUS

PDF

54.0 KB Created: 2020-08-11 12:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6c13d64b38d4967cd8642666919316f SHA-1: adffdb2456e474c58bf0dfcdec48a5871477eea5 SHA-256: f3bf8a3b2ca804e878a06ef2ef722a8ec77db42d09bb5fcfe332469fc27944e3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector infrastructure, which is designed to lead users to malicious content. The document body, though malformed, contains keywords related to educational worksheets, suggesting a lure. The ML classifier strongly indicates maliciousness. The primary IOC is the malicious redirector URL.

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=addition+and+subtraction+of+fractions+worksheets+pdf
    • http://files.goldcountryloveonaleash.org/uploads/1/3/0/9/130968934/f3e8c868e2d3c.pdf
    • http://files.aeea4u.org/uploads/1/3/1/6/131606666/namatipedomuxinim.pdf
    • http://files.ondspotentertainmentandprinting.com/uploads/1/3/2/6/132681757/9508602.pdf
    • http://files.howardcountytaxicab.com/uploads/1/3/1/3/131383514/povikogefutabe.pdf
    • http://files.mentorlylarye.com/uploads/1/3/2/8/132814898/8470166.pdf
    • https://cdn.shopify.com/s/files/1/0434/6707/9830/files/43070765356.pdf
    • https://cdn.shopify.com/s/files/1/0432/3963/7155/files/economy_efficiency_and_effectiveness.pdf
    • https://cdn.shopify.com/s/files/1/0427/3651/7286/files/pedagogy_of_biological_science_tnteu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9218/1153/files/mosopavemelaw.pdf
    • https://cdn.shopify.com/s/files/1/0435/4949/1359/files/40562810173.pdf
    • https://cdn.shopify.com/s/files/1/0431/4526/5312/files/20796742024.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/96159818558.pdf
    • https://cdn.shopify.com/s/files/1/0431/6590/9160/files/steel_construction_manual_14th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/7066/8448/files/39659898534.pdf
    • https://cdn.shopify.com/s/files/1/0433/2145/8853/files/69540440600.pdf
    • https://cdn.shopify.com/s/files/1/0436/6771/8309/files/rubozebeketuninubevujiru.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000080d5.bin
4f23560302f77df18584287aea1691794d2894dcfed2a65dc64e5f7f64b6e494		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80D5 5496 bytes
font_01_sfnt_off0000938a.bin
9b103380116bccfcbca692c5f4f3b5914a8e898d3f019d8ba2cb37e46fb800ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x938A 9712 bytes
font_02_sfnt_off0000b50b.bin
4a83d890a47edb08c66ed977e452dfc2aca54227ac21f6fa21ed0d0aaea40951		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB50B 16116 bytes

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