Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc39b204636836b…

MALICIOUS

PDF

48.8 KB Created: 2020-07-15 05:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fd71e2bbafddd6e4b3d6e6a29de5765 SHA-1: b2aef6fee7874b50f6e4daf9e76c9067d71d6d77 SHA-256: 5cc39b204636836b88994998713aadb80c57b34373a9c548392199fb64e07e0a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious redirector and a large number of external links suggests an attempt to direct users to harmful content, likely for SEO spam or phishing purposes.

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/wb?keyword=cropping%20pattern%20definition%20pdf
    • http://files.phoenixassociates.com/uploads/1/3/1/4/131407761/ginaxopubakegofodave.pdf
    • http://files.wholeyoats.com/uploads/1/3/0/7/130776673/4141290.pdf
    • http://files.attotherapyus.com/uploads/1/3/0/7/130775150/kadiligavujozol_lexexevarukur_gowaxutixigix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/zuwovoxur.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/favubedezemopazejive.pdf
    • https://cdn.shopify.com/s/files/1/0431/4277/4935/files/89768126139.pdf
    • https://dexuzonuluw.files.wordpress.com/2020/06/4171531093.pdf
    • https://mifetaf234194639.files.wordpress.com/2020/07/sazazozojixikafeweve.pdf
    • https://vutukutinom106189484.files.wordpress.com/2020/06/93828524742.pdf
    • https://wemekuwi606608615.files.wordpress.com/2020/07/ledibifubaruzoporife.pdf
    • https://wididoripelo.files.wordpress.com/2020/07/5126562723.pdf
    • https://cdn.shopify.com/s/files/1/0429/4836/2399/files/jisibope.pdf
    • https://cdn.shopify.com/s/files/1/0432/9173/8277/files/dizajuriv.pdf
    • https://cdn.shopify.com/s/files/1/0430/3772/0733/files/68147103639.pdf
    • https://cdn.shopify.com/s/files/1/0428/9226/3583/files/81398091032.pdf
    • https://cdn.shopify.com/s/files/1/0434/4443/7144/files/lunavitovijivevipadowo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/18168325659.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/19336936590.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_off000081ec.bin
d789be96c08499c26ce3864d3d22c4c967baa84a028cd486576ba1da64d987f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81EC 4812 bytes
font_01_sfnt_off00009256.bin
28974ad393123a65a633c0a6704022f7c3efeff81b2534777da4bbb38e366419		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9256 10400 bytes

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