Malicious PDF — malware analysis report

Static analysis result for SHA-256 938f7d1fe5e69c00…

MALICIOUS

PDF

43.8 KB Created: 2020-08-07 17:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f507078ad5c56928a99bd51ee504168 SHA-1: dd6526c475a726ccbde5ebd5368ba1d61c666567 SHA-256: 938f7d1fe5e69c004c98855a2919f868c7bba1da7c9d80b9cdf4c189fd358110
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. Another critical heuristic identifies a large external PDF link farm, suggesting a potential SEO manipulation or content distribution scheme. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the sheer volume of links and the presence of a malicious redirector point towards a delivery mechanism for further malicious 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.ru/pify?keyword=cell+cycle+mitosis+and+meiosis+pdf
    • http://tibiboxa.bloomingtoncenterformindfulness.com/uploads/1/3/0/8/130874493/a62fa329024ca.pdf
    • http://tewivug.greaterfortpolkarearealtors.com/uploads/1/3/1/4/131452883/bb9bc9b0c9b2d46.pdf
    • http://files.mrlibutti.com/uploads/1/3/1/8/131856827/vewupunajiwokoxab.pdf
    • http://files.cdrayofhope.com/uploads/1/3/0/8/130874493/3546584.pdf
    • https://cdn.shopify.com/s/files/1/0433/6130/4728/files/povusulalolufolimo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/rokulikazubigare.pdf
    • https://cdn.shopify.com/s/files/1/0432/7876/2140/files/the_catholic_bible.pdf
    • https://cdn.shopify.com/s/files/1/0439/2553/6936/files/76265439811.pdf
    • https://cdn.shopify.com/s/files/1/0433/3653/2136/files/kerekotusologapupulut.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/4780083199.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6775/files/melavaxurewij.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3903/files/ruxixixulamebima.pdf
    • https://cdn.shopify.com/s/files/1/0430/6855/5415/files/gezobadasuzozul.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/biwojabafova.pdf
    • https://cdn.shopify.com/s/files/1/0429/5180/3039/files/72090686269.pdf
    • https://cdn.shopify.com/s/files/1/0434/2284/3036/files/fodiz.pdf
    • https://cdn.shopify.com/s/files/1/0427/6187/9719/files/bojimani.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4650/files/xigurob.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006db8.bin
4795e0760fd46374afff93a3dbf0087b63cac0d1c676b3f7cb9dccc7b49ac463		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB8 5212 bytes
font_01_sfnt_off00007f6c.bin
106045a52cc06eddfa81c78373cc36384c016d668c86671ab60e82a785c73dd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F6C 10084 bytes

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