Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f9ed52c8e0facd…

MALICIOUS

PDF

44.5 KB Created: 2020-08-14 02:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2db56bb786ab06da4864a531b8ca63b8 SHA-1: 12283827672f88c80e5ea5edb51ae94e91274f66 SHA-256: d0f9ed52c8e0facd4573a1bbd51e5cf0653b4ee35871486404f9321c5e2e876b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a large number of embedded links, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly indicated maliciousness. The primary IOC is the redirector URL, which likely leads to a malicious payload.

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.com/pify?keyword=safe+alcohol+drinking+guidelines+canada
    • http://lelikaz.alexatamianphotography.com/uploads/1/3/1/4/131483138/4660629.pdf
    • http://files.southtownscatholic.org/uploads/1/3/1/6/131606392/lasumegifanireji.pdf
    • http://files.halsteadbowlsclub.com/uploads/1/3/0/9/130969742/1356255.pdf
    • http://files.fdragflorida.com/uploads/1/3/1/4/131438453/8315535.pdf
    • https://cdn.shopify.com/s/files/1/0428/1624/1831/files/nikon_d50_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wesuwalaloluxafim.pdf
    • https://cdn.shopify.com/s/files/1/0436/2980/5726/files/nazebiwed.pdf
    • https://cdn.shopify.com/s/files/1/0429/5327/7589/files/zuxirowu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1338/1028/files/77461180779.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/90009263614.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3287/files/gixalujowusuwotuwax.pdf
    • https://cdn.shopify.com/s/files/1/0435/5263/7091/files/openssl_wildcard_certificate.pdf
    • https://cdn.shopify.com/s/files/1/0437/0844/8919/files/safenujul.pdf
    • https://cdn.shopify.com/s/files/1/0430/9568/7328/files/70866736805.pdf
    • https://cdn.shopify.com/s/files/1/0440/4068/3685/files/maikel_jaksone_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0431/1236/6229/files/88853816136.pdf
    • https://cdn.shopify.com/s/files/1/0428/9187/0375/files/amadeus_hotel_software_free.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_off00006ecf.bin
074ea3bd1dd75f4bd84d77d4f8b0b40fd95f757a243f2e5f8f6029d6992d374a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ECF 5452 bytes
font_01_sfnt_off00008140.bin
10d3acaa9d99a4d788ef391099f24fc1970745354e87fe9df2096de5e545a96a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8140 10212 bytes