Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be57ef7e425a0fe…

MALICIOUS

PDF

42.5 KB Created: 2020-08-20 02:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa73055e5db3df29b63a2cda081f6416 SHA-1: 0a4560de6838aba355843b0e73cb4ed159d3a337 SHA-256: 6be57ef7e425a0fe830a0bbd10c5524ad1e3328de1238f42a51d05c57ecf3acf
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document is disguised as an 'Overtime request form 428' to trick users into clicking embedded links. One of these links, 'https://ttraff.com/pify?keyword=overtime+request+form+428', points to known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=overtime+request+form+428
    • http://files.muellerhomeenvironment.com/uploads/1/3/1/6/131607103/c4118120827f703.pdf
    • http://files.gobo-projector.eu/uploads/1/3/0/8/130874631/8935488.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5063/8241/files/gilgo_surf_cam.pdf
    • https://cdn.shopify.com/s/files/1/0428/0372/4455/files/40532730035.pdf
    • https://cdn.shopify.com/s/files/1/0435/6508/8936/files/lezuwusigitonukuterupav.pdf
    • https://cdn.shopify.com/s/files/1/0429/7372/4825/files/wirumoxaraf.pdf
    • https://cdn.shopify.com/s/files/1/0433/8122/7672/files/2345411488.pdf
    • https://cdn.shopify.com/s/files/1/0434/6966/8517/files/10247804405.pdf
    • https://cdn.shopify.com/s/files/1/0438/8339/7275/files/diablo_1_belzebub_warrior_guide.pdf
    • https://cdn.shopify.com/s/files/1/0439/0718/6843/files/bodybuilding_workout_chart_with_images.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_off00006a93.bin
22ae819b0d0f7b9cfd29852e66b21cece2cd69dde397ea6f5959cb6855dc6f9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A93 5296 bytes
font_01_sfnt_off00007c9e.bin
dbbda4050fe67f815ae219c5a9d38895dc3b82e4b43df826239eaf634409a7fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C9E 9596 bytes