Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b5c760994c1444…

MALICIOUS

PDF

41.5 KB Created: 2020-08-13 23:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a6b0dfff07376054688cc0a667b3929 SHA-1: 181d9dae240c6ec9dd76938fd3ae0761ad17d1a3 SHA-256: b9b5c760994c144428b73e310997aefbf3cbd32b665a20991c021b87b40c7ca4
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The primary attack pattern appears to be a link farm designed to redirect users to malicious content, likely for phishing or malware distribution.

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.ru/pify?keyword=attractive+birds+wallpaper
    • http://files.torontoflowergallery.com/uploads/1/3/1/4/131453555/8625456.pdf
    • http://files.jg3tattoo.com/uploads/1/3/1/6/131607310/kezawovoluxomigozoko.pdf
    • http://files.thecraftloungebeer.com/uploads/1/3/0/9/130969659/bisaxub.pdf
    • http://sazajek.beingasunflower.org/uploads/1/3/1/8/131856935/d6d43d3c8.pdf
    • http://files.pioneerradio.org/uploads/1/3/0/7/130740112/modajebukuzozi.pdf
    • https://cdn.shopify.com/s/files/1/0435/7714/7547/files/tupugaxolisigulomevo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8286/6072/files/81203931450.pdf
    • https://cdn.shopify.com/s/files/1/0439/0476/2011/files/73338201341.pdf
    • https://cdn.shopify.com/s/files/1/0433/0441/9478/files/blues_chords_progression_piano.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/83684860086.pdf
    • https://cdn.shopify.com/s/files/1/0434/1805/8901/files/56346557533.pdf
    • https://cdn.shopify.com/s/files/1/0431/0797/5330/files/36888939564.pdf
    • https://cdn.shopify.com/s/files/1/0432/6614/6472/files/devizidatobepefaxepapa.pdf
    • https://cdn.shopify.com/s/files/1/0436/6345/8457/files/39823304280.pdf
    • https://cdn.shopify.com/s/files/1/0434/4243/8310/files/zodepuduba.pdf
    • https://cdn.shopify.com/s/files/1/0430/2821/8010/files/64400783559.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/32149809644.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_off0000648d.bin
8e8713285f600bd1f65b80037cc546f2b2802b616690ed8e361c2ca1c9484d47
pdf-font-stream PDF embedded font (sfnt) at offset 0x648D 5348 bytes
font_01_sfnt_off000076d2.bin
2e8a410c7314e9619ad9061aab41124b0ba58217d2a93eb26f281a985b9e4735
pdf-font-stream PDF embedded font (sfnt) at offset 0x76D2 10120 bytes