Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c1ed319be83dd0…

MALICIOUS

PDF

95.2 KB Created: 2020-08-10 12:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77b7b3fea776cac3ebc7c75bbdba73b0 SHA-1: d1be63a4f3d349110c48f86090dcee59f8db6a97 SHA-256: 66c1ed319be83dd0b8de4faaf333c8c0b5573d4bc2ad30ba5022d9eee52fbfc3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, with one specifically identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content. The primary malicious IOC is the redirector URL, which likely leads to further stages of infection.

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=automating+inequality+virginia+eubanks+pdf
    • http://files.lakeshorequiltcompany.com/uploads/1/3/2/6/132681488/2361988.pdf
    • http://files.northopchurch.org/uploads/1/3/0/7/130740078/pavoberata.pdf
    • http://sagisedi.huanirataxservices.com/uploads/1/3/0/8/130874493/89da9d73259.pdf
    • http://files.morganraebrown.com/uploads/1/3/1/4/131411474/gixake.pdf
    • http://lukuri.jimpendergrass.com/uploads/1/3/0/7/130775062/sapubofatibo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2425/9992/files/44624088773.pdf
    • https://cdn.shopify.com/s/files/1/0429/3053/6614/files/toastmasters_manual_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2103/files/29077482696.pdf
    • https://cdn.shopify.com/s/files/1/0434/5770/8185/files/satel.pdf
    • https://cdn.shopify.com/s/files/1/0430/9162/4096/files/8890770785.pdf
    • https://cdn.shopify.com/s/files/1/0435/2580/0087/files/pamixopivaku.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bifivejeg.pdf
    • https://cdn.shopify.com/s/files/1/0437/1628/0475/files/setinabepodobanon.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/lunukawu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7048/7712/files/92583728341.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_off000136e6.bin
8ecc37339165ae4a6152622b21916c113f3463e3bae2016d55aba3e55447abb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x136E6 5844 bytes
font_01_sfnt_off00014ab5.bin
5d7f8875827dcf5ba648c6906079c35989497317970c1112c870e658931d1b10
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB5 10816 bytes