Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a0f35c6a309b9a…

MALICIOUS

PDF

48.9 KB Created: 2020-08-07 23:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d079585686b70d2ac002ffe5e40e7ce SHA-1: 5e267a72ac47bf69c53bd76b9419864843431ac9 SHA-256: 99a0f35c6a309b9a793bf80ceddf780d8dd867d7ab7b818b108f7a330994d1d2
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Brachiaria brizantha marandu pdf' and includes the malicious URL. The presence of many external PDF links suggests a link farm or SEO poisoning tactic. The ML classifier 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.com/pify?keyword=brachiaria+brizantha+marandu+pdf
    • http://files.abprecisionelectric.com/uploads/1/3/1/6/131637385/a01ba7d4.pdf
    • http://files.gzastava.com/uploads/1/3/1/3/131381850/4f172eeb08.pdf
    • http://files.doctordesha.com/uploads/1/3/0/7/130775393/fabinobore_fozexoxufaxa_kuropiji_gixekuv.pdf
    • http://files.redtrustbushey.org/uploads/1/3/1/6/131637307/zosakojofutom-gozobosukowemi-joruparod.pdf
    • http://pebadulux.cultureandmovement.com/uploads/1/3/1/1/131164239/xonorefumularev.pdf
    • https://cdn.shopify.com/s/files/1/0434/2677/5196/files/nitozozosuwopadip.pdf
    • https://cdn.shopify.com/s/files/1/0431/9199/2481/files/14916643479.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/63392362431.pdf
    • https://cdn.shopify.com/s/files/1/0431/5434/2042/files/write_up_forms.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/15714929785.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7189/files/14830664164.pdf
    • https://cdn.shopify.com/s/files/1/0431/8711/0037/files/vozevilujujuxenesufovefi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7904/files/mogoruva.pdf
    • https://cdn.shopify.com/s/files/1/0435/7590/2363/files/gelebemanuxofedawesugeva.pdf
    • https://cdn.shopify.com/s/files/1/0434/8307/0629/files/diablo_hellfire_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/8227/6250/files/9255680134.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57355052908.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/zezimadibewazir.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_off00008065.bin
b2d4507f2d2b2c30bb0091b5cf2931972ab725efcf18a7e5aca54a3abc1ff08c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8065 5424 bytes
font_01_sfnt_off000092b3.bin
62e5662cfc0c941fcde5d59d05dccc8769fd6bf214de7d29db89c9b653fffc2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92B3 10468 bytes

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