Malicious PDF — malware analysis report

Static analysis result for SHA-256 648479d8f463e93f…

MALICIOUS

PDF

38.7 KB Created: 2020-08-21 05:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 195d40689b610a4185b17778c7f095c2 SHA-1: 6fc8839c1c5a1b0bb5d4dbd8d4dfd46d1deddce6 SHA-256: 648479d8f463e93f75487da6265fd34c9394e36801e49d3b479fe383a7d3fb65
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a malicious redirector link disguised as a school uniform shop. The link leads to a page that hosts a large number of other PDF files, forming a link farm. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a malicious URL. The document body itself is largely unreadable binary data, but the embedded link and the heuristic firings clearly indicate a phishing or redirection attempt.

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=aranmore+catholic+primary+school+uniform+shop
    • http://files.cornerhealthfoods.com/uploads/1/3/1/4/131408353/nebujaxelebez-tivizazepozimik-wumegofego-wemul.pdf
    • http://files.nabasco.net/uploads/1/3/2/7/132741029/f90f472e19926.pdf
    • http://wurodapu.threelapparel.com/uploads/1/3/0/7/130775612/mokijenizifuritu.pdf
    • http://files.washnword.com/uploads/1/3/0/8/130874379/8276497.pdf
    • http://files.whispersisterstudio.com/uploads/1/3/0/8/130874520/lidixo-lonerodoputax-xukegu-zojelorelofaxux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7357/6865/files/99247987354.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/maxuxipowuparulupanezar.pdf
    • https://cdn.shopify.com/s/files/1/0437/6874/2040/files/36514143009.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/mbox-_short._txt.pdf
    • https://cdn.shopify.com/s/files/1/0434/8051/4726/files/buncefield_disaster_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/menunutuked.pdf
    • https://cdn.shopify.com/s/files/1/0439/2671/6584/files/55064461901.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/kadawigoxumubixewulutax.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9284441163.pdf?v=1594212706
    • 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_off000057ed.bin
ca6f07fd088e7534e0c9d7b23251aefb1ab94d3836f56bc0f30abb483720e7fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x57ED 5348 bytes
font_01_sfnt_off000069f1.bin
40fea0edfb6100fd954ff3647917d69de5fe015c585cf443a614a0d560aa6409
pdf-font-stream PDF embedded font (sfnt) at offset 0x69F1 10580 bytes