Malicious PDF — malware analysis report

Static analysis result for SHA-256 885229e3c5913727…

MALICIOUS

PDF

38.4 KB Created: 2020-08-15 12:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48032a7273c2a8bd5b2328e7d96ec4cb SHA-1: 34806331a3a2c5bf9c894d4e2c6a3b0c58beacdc SHA-256: 885229e3c591372735d9be385f5db51c456d6e391066f064af6dfec630d7d049
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or SEO manipulation scheme to drive traffic to malicious sites.

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/wb?keyword=faa%20rotary%20wing%20handbook%20pdf
    • http://files.healthstartfoundation.org/uploads/1/3/1/3/131398455/ramudezeviwexiw.pdf
    • http://files.lenazavaroni.co.uk/uploads/1/3/0/9/130969004/1114326.pdf
    • http://files.freehandsilversmithco.com/uploads/1/3/1/4/131406806/abc449.pdf
    • http://fajamilo.gospelblue.org/uploads/1/3/1/3/131380213/siwefovelo.pdf
    • http://kesiwisuw.wrkj.org/uploads/1/3/0/7/130776321/702aa0c0644.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/4597/6224/files/file_was_built_for_unsupported_file_format.pdf
    • https://cdn.shopify.com/s/files/1/0433/3800/6686/files/kivogejujaduj.pdf
    • https://cdn.shopify.com/s/files/1/0430/7494/5184/files/rekozukijajoteregajozuso.pdf
    • https://cdn.shopify.com/s/files/1/0432/6139/5102/files/97966697942.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/76528165765.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6358/files/business_analyst_responsibilities.pdf
    • https://cdn.shopify.com/s/files/1/0433/9918/4551/files/womivubomagi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8027/7406/files/61112215647.pdf
    • https://cdn.shopify.com/s/files/1/0451/7101/5829/files/5669132078.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51106899687.pdf
    • https://cdn.shopify.com/s/files/1/0433/6808/7717/files/fabazasekafaguwogolewopu.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000448c.bin
95ce99eb141217da6eeeea5d8930ee19e174ccc0cb3c033214913d3dcb3bf564		 pdf-font-stream PDF embedded font (sfnt) at offset 0x448C 5444 bytes
font_01_sfnt_off00005725.bin
32c56a49eb73aa9dc1641f3795afb148a44675c4b82360ee48fa4a64bd69e27e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5725 9460 bytes
font_02_sfnt_off000077c7.bin
a1e2968ca8c7638dd4bef022e186f3fea2b098bc52bbc7b81535a6634822059c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C7 16060 bytes

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