Malicious PDF — malware analysis report

Static analysis result for SHA-256 6831d0310c06c67c…

MALICIOUS

PDF

42.1 KB Created: 2020-07-29 08:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b550bdb12706900dac266936e6670fd SHA-1: 6a4e258c765348c59836edb030e594632b7c02cd SHA-256: 6831d0310c06c67c3c37448332fb0cea5f0d7086240b3d3c3fe6685de9012e2e
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service designed to obscure the final destination. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector link confirms the intent to lead users to potentially harmful content. While no scripts were extracted, the PDF structure itself is weaponized to facilitate link-based attacks.

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=arabic+worksheets+for+kg2+pdf
    • http://files.plannprogress.com/uploads/1/3/1/4/131483830/sevovudavi.pdf
    • http://files.organicnaturopathicservices.com/uploads/1/3/1/6/131606864/2647897.pdf
    • http://files.newmtmoriahamejax.org/uploads/1/3/1/4/131437491/nuvixibejefuvo.pdf
    • http://files.notan.info/uploads/1/3/0/8/130874143/275863.pdf
    • http://files.shareschinese.com/uploads/1/3/1/6/131636769/togadogafusiso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/6423/9014/files/20247115748.pdf
    • https://cdn.shopify.com/s/files/1/0435/4025/0775/files/41418553009.pdf
    • https://cdn.shopify.com/s/files/1/0432/3845/7508/files/zulivenimozujege.pdf
    • https://cdn.shopify.com/s/files/1/0437/4226/5498/files/29109580225.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58097506778.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/16764934353.pdf
    • https://cdn.shopify.com/s/files/1/0436/9969/9866/files/mojidifo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9273/8201/files/pajipum.pdf
    • https://cdn.shopify.com/s/files/1/0432/4209/4756/files/6401026856.pdf
    • https://cdn.shopify.com/s/files/1/0433/7503/4520/files/50833355870.pdf
    • https://cdn.shopify.com/s/files/1/0428/9583/5295/files/68372876905.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2103/files/29077482696.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_off00005c53.bin
e25f30d9a30298c387c5147be8d9ef7b88a37968a42d9f3fac1664981e5d78fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C53 5484 bytes
font_01_sfnt_off00006f19.bin
271a8482d92fa73abf315b50555598eca06b434190157eab8738d603fa4c8409		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F19 14336 bytes

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