Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2473a4075f57d7…

MALICIOUS

PDF

44.6 KB Created: 2020-07-18 06:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 373d3517116e88574b58597d77d7b60a SHA-1: 88c377fe105d7e81b50a2dccbc7b8adbe9d8022a SHA-256: 7a2473a4075f57d7e0e5c341b2201eb64808072de69e0e7a389f8f90d556179e
154 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a tactic to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector and link farm.

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/wb?keyword=celula%20animal%20vegetal%20y%20bacteriana%20pdf
    • http://files.raynayler.net/uploads/1/3/0/7/130739510/8092526.pdf
    • http://files.purpleinkpublishing.com/uploads/1/3/1/4/131437844/mikofoxaxomojope.pdf
    • http://files.jessicamixon.com/uploads/1/3/0/7/130775033/5fc580170ec.pdf
    • http://files.worldsbestpinotage.com/uploads/1/3/0/7/130775867/degimosuxatomotobe.pdf
    • http://files.rfjnoel.com/uploads/1/3/1/4/131452935/6eb2d1aed91.pdf
    • http://files.obituar.org/uploads/1/3/0/7/130776151/c2e407b11e9.pdf
    • http://files.goldendebt.org/uploads/1/3/0/8/130813108/8c253dc6708e36.pdf
    • http://files.buickcluboftheredwoods.com/uploads/1/3/1/4/131438741/4931704.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://kalafinis.files.wordpress.com/2020/07/podasugawasanevagoramut.pdf
    • https://fewiveke.files.wordpress.com/2020/07/tonatogogineturibewixu.pdf
    • https://suwaboto.files.wordpress.com/2020/06/pagesiripugida.pdf
    • https://xebedidepu.files.wordpress.com/2020/07/16482294132.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9789/files/58789804517.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8882/files/17869687103.pdf
    • https://cdn.shopify.com/s/files/1/0429/8529/1937/files/toroxixa.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/xetonafuzo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/43355992932.pdf
    • https://cdn.shopify.com/s/files/1/0429/2473/6678/files/nopodudopowukajig.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nuvororixepexovi.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_off00006f29.bin
2caac53e820e57f343904c03016921ccf2766c781a88da3161fa16685258bde5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F29 5396 bytes
font_01_sfnt_off00008178.bin
a85ce103c189ba7c348315aa15f3873d81d5d4c4d5bb1e5354f1d3b16fa1af44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8178 10696 bytes

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