Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f21702cbaaebde…

MALICIOUS

PDF

41.8 KB Created: 2020-08-20 06:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c84c14a3d6875f9286ee358b93b3839c SHA-1: 21cd1731ba0a4a99e546b0054d31d893975c510d SHA-256: f1f21702cbaaebde2224045f50e57d131ea49aa8c9a7200c16e05f367775389b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to shopify domains, but one critical link directs to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though partially corrupted, contains the URL that triggered the malicious redirector heuristic, suggesting a lure to a malicious site.

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=estacion+chamartin+telefono+informacion
    • http://files.hop2osoda.com/uploads/1/3/1/6/131607063/meboxafadoxebif-damito-fosuvaxidojeb-fatum.pdf
    • http://gilena.narrowminded714.com/uploads/1/3/0/7/130776394/5002075.pdf
    • http://files.jkcakecreations.co.uk/uploads/1/3/1/4/131407164/301c4a298.pdf
    • http://kejujiva.cfmmirrors.ca/uploads/1/3/1/6/131606490/gixigaxixutulepebagu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1416/7450/files/bailey_jay_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0428/2214/0063/files/33238264978.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/anomia_social_anemia_estatal.pdf
    • https://cdn.shopify.com/s/files/1/0437/5828/9045/files/free_flower_border_for_word_document.pdf
    • https://cdn.shopify.com/s/files/1/0430/6268/9946/files/71223380037.pdf
    • https://cdn.shopify.com/s/files/1/0434/3808/0167/files/anticuerpos_antinucleares.pdf
    • https://cdn.shopify.com/s/files/1/0435/8501/1869/files/48474709496.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23313492251.pdf
    • https://cdn.shopify.com/s/files/1/0431/4529/8080/files/30636608359.pdf
    • https://cdn.shopify.com/s/files/1/0434/1802/6142/files/pulisezakazilufokol.pdf
    • https://cdn.shopify.com/s/files/1/0437/8096/4510/files/ansi_b16._5_standard.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_off0000616f.bin
e21e6d2f4b29c0e1acade74612c1172c72e97fa12ced39bff2d4412501005ab4
pdf-font-stream PDF embedded font (sfnt) at offset 0x616F 5080 bytes
font_01_sfnt_off00007281.bin
a03e2972e8e69b9f8ad58bc01692e79aa0ccb86434789c1b78ffd2b46c3b6a18
pdf-font-stream PDF embedded font (sfnt) at offset 0x7281 11660 bytes