Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe8c546ff83a6ac…

MALICIOUS

PDF

33.1 KB Created: 2020-08-19 13:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75b47f408269d3d48998949f2084b77f SHA-1: c0b4aeb572268e9bb3331bb0349af8d0e1dbc82b SHA-256: 6fe8c546ff83a6ace30649d7ad8c2509e1e396b9e7b134d8c12105d3efb3de7e
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Environment agency culvert design guide' and a URL that appears to be part of a link farm designed to manipulate search engine results. The presence of embedded links and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful content.

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.cc/pify?keyword=environment+agency+culvert+design+guide
    • http://files.prettybeautycanada.com/uploads/1/3/0/8/130873822/6135391.pdf
    • http://files.sterlingartsanddesign.com/uploads/1/3/1/3/131381919/2a68e.pdf
    • http://files.ketsup-pinoy.com/uploads/1/3/0/7/130775337/fumir.pdf
    • http://files.forwhatitsearthproject.com/uploads/1/3/2/8/132814958/zipuvokefubub.pdf
    • http://files.readingfamilyaid.org/uploads/1/3/1/3/131398406/jokumaxuwozabu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/7015/9016/files/xaduxaredanazoxepatafowe.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5023/files/42164975021.pdf
    • https://cdn.shopify.com/s/files/1/0432/0804/8808/files/zujegileledatazijalufonu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3285/files/kajuzaweritokidikik.pdf
    • https://cdn.shopify.com/s/files/1/0436/8911/5801/files/cauda_equina_syndrome_patient_information_leaflet.pdf
    • https://cdn.shopify.com/s/files/1/0446/9299/6252/files/alopecia_pronunciation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/2420/3424/files/68019939024.pdf
    • https://cdn.shopify.com/s/files/1/0431/6410/6908/files/14211113838.pdf
    • https://cdn.shopify.com/s/files/1/0430/4034/2169/files/11032979130.pdf
    • https://cdn.shopify.com/s/files/1/0431/7849/2072/files/runowijukasuzubatoja.pdf
    • https://cdn.shopify.com/s/files/1/0437/6743/1320/files/46059533792.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_off000044f0.bin
2bb2ed7f0e0af477921d4f171fcb6faf528ad177116f89628398de937ba841e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44F0 5380 bytes
font_01_sfnt_off00005724.bin
2204180124f8e3cfa8a4a7a696839c6dae0c089d19b0218c601ddf834d89cf66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5724 9436 bytes

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