Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5a7b6fb86557fa…

MALICIOUS

PDF

45.2 KB Created: 2020-08-14 00:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c141cd76bf295261fc4c5990ebe93289 SHA-1: 11516380c93816f7dd77b88714f08bc29d58ea68 SHA-256: 8c5a7b6fb86557fa88f259788255de95e418d0b1fb62aecb077a8f29d20e57f8
150 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to click on these links, which likely lead to further malicious payloads or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=organic%20rearrangements%20pdf
    • http://nokoxik.wtrentraglandjrfoundation.org/uploads/1/3/0/7/130776688/7889443.pdf
    • http://files.michaelbraunlin.com/uploads/1/3/1/0/131069978/2684c3.pdf
    • http://files.masjidfreehaven.org/uploads/1/3/0/8/130874067/7371706.pdf
    • http://sudokefa.queensnycellphonerepair.com/uploads/1/3/2/6/132681482/386656.pdf
    • http://files.janeemilyblack.com/uploads/1/3/0/7/130775242/nenejodat-farijadalozud-tumimaruke-taxekazavedusu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9889/8592/files/blue_bottle_experiment.pdf
    • https://cdn.shopify.com/s/files/1/0437/4193/7818/files/53537081162.pdf
    • https://cdn.shopify.com/s/files/1/0430/8942/8637/files/denemakerujuzatojosexo.pdf
    • https://cdn.shopify.com/s/files/1/0438/3988/1376/files/4125795931.pdf
    • https://cdn.shopify.com/s/files/1/0439/2439/0056/files/kadabipa.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/trastornos_alimenticios_obesidad.pdf
    • https://cdn.shopify.com/s/files/1/0431/2236/0481/files/adrenalina_y_noradrenalina.pdf
    • https://cdn.shopify.com/s/files/1/0437/0700/7127/files/wowamisiwuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/1901/0201/files/pixeke.pdf
    • https://cdn.shopify.com/s/files/1/0437/2417/7557/files/apologize_onerepublic_piano.pdf
    • https://cdn.shopify.com/s/files/1/0433/9276/2017/files/73408073524.pdf
    • https://cdn.shopify.com/s/files/1/0434/9807/8372/files/fozevenusavekakuzasuledur.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_off000072ed.bin
f22bef407383e95ae7691df45fc27e5da0a38b10cba932c15b078294e41cc279
pdf-font-stream PDF embedded font (sfnt) at offset 0x72ED 5468 bytes
font_01_sfnt_off0000856e.bin
07344e64e31e839d20d41ab988605eca78af79e1688aeaf7bed7828e7227e52c
pdf-font-stream PDF embedded font (sfnt) at offset 0x856E 10100 bytes