Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e42a50dd780b2b…

MALICIOUS

PDF

39.3 KB Created: 2020-08-09 02:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f397975a0ce44004a3e4732eb59d80f9 SHA-1: a6690f74baea41e380e265c36dd0a70095925572 SHA-256: c3e42a50dd780b2b54b79cd0132c37dcfa6aa8078d1cc30cfa07b77ec463c1a9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a link farm and a malicious redirector, indicating a phishing or scam attempt. The primary malicious URL is https://ttraff.com/pify?keyword=precalculus+topics+pdf, which is designed to lead users to further malicious content. The ML classifier strongly supports the malicious verdict.

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=precalculus+topics+pdf
    • http://files.markpenzak.com/uploads/1/3/0/8/130874240/2240412811efab8.pdf
    • http://files.scorecustom.com/uploads/1/3/1/4/131408103/2eacf.pdf
    • http://xizapi.simplywrightfitness.com/uploads/1/3/1/6/131606056/bd0673558815e.pdf
    • https://cdn.shopify.com/s/files/1/0443/6580/7772/files/facebook_revenue_model.pdf
    • https://cdn.shopify.com/s/files/1/0435/1760/8090/files/alternative_investments_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/1383/2857/files/61357731000.pdf
    • https://cdn.shopify.com/s/files/1/0431/4395/4594/files/pitamuwux.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/55864873889.pdf
    • https://cdn.shopify.com/s/files/1/0431/0636/9703/files/how_to_restore_a_disk_image_mac.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7924/files/62852128138.pdf
    • https://cdn.shopify.com/s/files/1/0434/1504/4254/files/busumabip.pdf
    • https://cdn.shopify.com/s/files/1/0431/5791/3749/files/sonuvu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1995/9463/files/45273287501.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_off00005c61.bin
6441ffe78e45d288a7dfaa2032b980dad1c4aa901a18ecb3ff3e1cb5bd60fad1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C61 5152 bytes
font_01_sfnt_off00006df3.bin
59bfc681fafc46a05e0fa63a8408b8e16f5d478bb39dcdf142023d7fca55fadb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF3 10212 bytes

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