Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94dc1253d204125…

MALICIOUS

PDF

37.1 KB Created: 2020-10-04 03:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: f4688332ccbac743219f408095ebabb0 SHA-1: 2c336fd8cfa036cd079e96eac5b2c6084e9f77f7 SHA-256: c94dc1253d20412566f3539fddfc5bbcd3d3200bf24642901843ca26a8eef1f8
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL designed to look like a product search result for a laptop battery. The ML classifier strongly indicates maliciousness, and the presence of numerous links suggests a link farm or SEO poisoning attempt. No scripts were extracted, but the primary attack vector appears to be directing users to a malicious URL via a deceptive document.

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://ggtraff.ru/pify?keyword=hp+probook+6570b+battery In PDF document text
    • http://xesukaj.fruiggie.com/uploads/1/3/0/7/130775403/razobetalu.pdfIn PDF document text
    • http://files.cometinterceptor.space/uploads/1/3/1/4/131411596/48b7b1.pdfIn PDF document text
    • http://files.chestervilledancers.com/uploads/1/3/2/6/132681542/8293493.pdfIn PDF document text
    • http://files.bluedevilsoccer.org/uploads/1/3/1/4/131407445/pomewewuzoxiturufuf.pdfIn PDF document text
    • http://rupejo.appelfamilydairy.com/uploads/1/3/1/4/131438729/3600139.pdfIn PDF document text
    • http://files.overheadcranesair.com/uploads/1/3/1/8/131871850/a8234cb5.pdfIn PDF document text
    • http://xadetelu.bobrabbit.com/uploads/1/3/1/3/131398101/salixagikit-gevejezutewo.pdfIn PDF document text
    • http://xowalovod.brightondentalclinic.com/uploads/1/3/1/4/131438062/xumesojopo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/3189/8523/files/47515555247.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9267/5227/files/best_rom_site_for_gamecube.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5028/2393/files/jometij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2323/5234/files/48634014706.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1063/7475/files/xerakagaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5168/2454/files/free_image_viewer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8831/3506/files/66525809963.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0517/3147/files/cedar_rock_park_directions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0128/2711/files/transformations_of_graphs_of_functions.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51F1 5372 bytes
SHA-256: c152ca8572be616dc95b26a9faaa4869130239a6a86ff21e9bfcb4c1dbcfb7ea
font_01_sfnt_off00006454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6454 10144 bytes
SHA-256: 7879696c03f66105d64a42de830d4aace2b57fbc5731e10bfae343b5bfe9560d

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