Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a483192fd6f53e7…

MALICIOUS

PDF

48.3 KB Created: 2020-07-31 04:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9bb194f805821746dc378cc5a125a32 SHA-1: a329b715d258b6469a85ba77a58ae214772f5e1b SHA-256: 0a483192fd6f53e76df211e6cb53ae50c47583f398aef6558f92a26a81b29b6f
154 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of embedded links, many of which point to external resources. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be malformed or obfuscated, preventing a clear understanding of its direct content, but the presence of numerous links and the malicious redirector strongly suggest an intent to lead users to harmful 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.ru/pify?keyword=estimation+and+costing+in+civil+engineering+notes+pdf
    • http://files.inspired2wellbeing.com/uploads/1/3/1/4/131437865/ad8a97927ff4.pdf
    • http://files.valleyriverarts.com/uploads/1/3/1/6/131636758/6f11883de408e84.pdf
    • http://files.bellecityvet.com/uploads/1/3/1/4/131453724/jolavopusuxu_laputisa_popujekede.pdf
    • http://files.oliviawoolf.com/uploads/1/3/1/4/131407572/8964719.pdf
    • http://files.dralexischesney.com/uploads/1/3/1/3/131381640/tawipifav-jepemenevipor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4993/4229/files/mapozadinol.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2494/files/xojixosib.pdf
    • https://cdn.shopify.com/s/files/1/0429/8086/8255/files/fifulorafusezit.pdf
    • https://cdn.shopify.com/s/files/1/0430/9162/4096/files/lafinuminigofilorupe.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/87161808305.pdf
    • https://cdn.shopify.com/s/files/1/0428/7217/6796/files/27006202829.pdf
    • https://cdn.shopify.com/s/files/1/0432/7351/9269/files/635577497.pdf
    • https://cdn.shopify.com/s/files/1/0435/4365/8650/files/8026935992.pdf
    • https://cdn.shopify.com/s/files/1/0432/6280/4136/files/nefosurixus.pdf
    • https://cdn.shopify.com/s/files/1/0432/0840/9250/files/bozegedutisexamupez.pdf
    • https://cdn.shopify.com/s/files/1/0428/3600/0931/files/68325093427.pdf
    • https://cdn.shopify.com/s/files/1/0433/8434/0630/files/lugupesorigoriripoke.pdf
    • https://cdn.shopify.com/s/files/1/0438/4178/1920/files/12870636130.pdf
    • https://cdn.shopify.com/s/files/1/0434/3654/0069/files/nubagi.pdf
    • https://cdn.shopify.com/s/files/1/0427/9028/9574/files/tumasegilaxexa.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e9c.bin
cad0d81ecfed46a09857b4ddeb76e0ee2649d934f697e6fcba7578a5184158b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E9C 5280 bytes
font_01_sfnt_off00009075.bin
c2ac038df026c9132fddc46fa0c8e011827796be4e193472c56f42d1df1afa9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9075 10284 bytes

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