Malicious PDF — malware analysis report

Static analysis result for SHA-256 803b083aa00eeff7…

MALICIOUS

PDF

47.0 KB Created: 2020-08-08 03:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 102b4aa1750515b9ceac86a92ae143ae SHA-1: aaeb3c6983858c7627b58b28862a14ab15f2e440 SHA-256: 803b083aa00eeff7db0f1728bca981cb90fd73b02df36f1667e53921e582d11d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or potentially malicious domains. The document body, though heavily obfuscated, contains text related to 'find the slope of each line worksheet pdf', suggesting a lure to disguise the malicious links. The ML classifier also strongly indicated maliciousness.

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=find+the+slope+of+each+line+worksheet+pdf
    • http://files.goodharborpottery.com/uploads/1/3/1/3/131379860/zotox.pdf
    • http://files.someoneelsemovie.com/uploads/1/3/1/3/131383377/9d757af73d0277e.pdf
    • http://files.roadswell.com/uploads/1/3/1/4/131453984/25628ea25bbb3.pdf
    • http://virolidi.corningteachersassociation.com/uploads/1/3/1/8/131856772/kofawaxedevegi.pdf
    • http://files.ogologo.ca/uploads/1/3/1/3/131398385/nunagikaf.pdf
    • https://cdn.shopify.com/s/files/1/0440/8508/4310/files/zodejovusojisudilive.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6486/files/40434051372.pdf
    • https://cdn.shopify.com/s/files/1/0428/8082/7558/files/63105382039.pdf
    • https://cdn.shopify.com/s/files/1/0432/6083/8050/files/10271536443.pdf
    • https://cdn.shopify.com/s/files/1/0432/0195/3952/files/sumevizonuba.pdf
    • https://cdn.shopify.com/s/files/1/0428/3197/0460/files/xeladidag.pdf
    • https://cdn.shopify.com/s/files/1/0433/8427/5109/files/codigos_control_universal_rca.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/85373947976.pdf
    • https://cdn.shopify.com/s/files/1/0438/4591/0678/files/18607777680.pdf
    • https://cdn.shopify.com/s/files/1/0431/6912/0413/files/fusixururuxadixalu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0790/9794/files/61743072449.pdf
    • https://cdn.shopify.com/s/files/1/0433/4449/4750/files/37841735873.pdf
    • https://cdn.shopify.com/s/files/1/0430/0151/2090/files/pubevorumef.pdf
    • https://cdn.shopify.com/s/files/1/0439/1701/7256/files/lokatekaxumikujuj.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_off0000799c.bin
a01be1ff3878a419a741a55cd5ca54ca682707707ae5f104c607b525af80ff45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x799C 5352 bytes
font_01_sfnt_off00008be1.bin
009c13519ef9c03c594a4a6f7d94e48166f98829a7628776818f4b67d9808ac4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE1 10164 bytes

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