Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac676a3a0b30901a…

MALICIOUS

PDF

50.7 KB Created: 2020-08-21 22:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0a1cc8e2b164c87e34faa4657122942 SHA-1: 26601f8d48c03c376f0b0eddad861fe4a3be8c74 SHA-256: ac676a3a0b30901a125180e048f7b1e9b5b357a2f47785277fbdc535da17c315
152 Risk Score

Malware Insights

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

The PDF contains a prominent link that, when clicked, redirects to a malicious URL. The document body text and heuristics indicate this is a lure for 'Android studio setup jdk path'. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the redirector is known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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=android+studio+setup+jdk+path
    • http://files.fauxmesticgoddess.com/uploads/1/3/1/8/131856381/gevaxil.pdf
    • http://jemovu.amykennymakeup.com/uploads/1/3/2/6/132682879/8251575.pdf
    • http://files.foster-willson.com/uploads/1/3/0/7/130739885/3b3505907ed0.pdf
    • https://cdn.shopify.com/s/files/1/0430/7222/5442/files/jubujiwujolimafigakadopow.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/39007814457.pdf
    • https://cdn.shopify.com/s/files/1/0432/6850/5766/files/report_stolen_canadian_passport.pdf
    • https://cdn.shopify.com/s/files/1/0437/5959/9765/files/55882629682.pdf
    • https://cdn.shopify.com/s/files/1/0434/0636/0725/files/self_advocacy_skills.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81603963226.pdf
    • https://cdn.shopify.com/s/files/1/0435/2016/3999/files/eee_3307_lab_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/2846/3271/files/temowe.pdf
    • https://cdn.shopify.com/s/files/1/0429/5150/8131/files/dizunifitorabawelixamu.pdf
    • https://cdn.shopify.com/s/files/1/0430/1645/4305/files/94967176809.pdf
    • https://cdn.shopify.com/s/files/1/0436/1663/2994/files/days_of_the_week_worksheets_for_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0432/5448/1058/files/ganesha_atharvashirsha.pdf
    • https://cdn.shopify.com/s/files/1/0449/9403/5880/files/34914764492.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/
    • https://cdn.shopify.com/s/files/1/0430/1645/4305

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000879d.bin
b8d126a3567ecc6e6179d07df4d8e05d9baf947b7db3a8eb0599395a7ab46c5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x879D 5144 bytes
font_01_sfnt_off00009911.bin
9b30b55ef26f6dd12cf1e507df943552a2d541745fb14eaa8d653af3ee82596a
pdf-font-stream PDF embedded font (sfnt) at offset 0x9911 10692 bytes