Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f2f7aadac0e91f9…

MALICIOUS

PDF

50.5 KB Created: 2020-08-07 06:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed2773eafd9a2b064580a4ebef6b6a19 SHA-1: 59a9aa50890bd0a9aac216485db532a95abd6292 SHA-256: 9f2f7aadac0e91f929d1a15e23e6052d5bd89fa5445231578d41ea1c758e32ac
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=cheddar+gorge+walk+pdf'. This URL is likely intended to redirect the user to a malicious site. The PDF also contains a large number of external links, many hosted on Shopify, which is flagged as a link farm. The ML classifier strongly indicates maliciousness.

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.cc/pify?keyword=cheddar+gorge+walk+pdf
    • http://files.southavenzetas1920.org/uploads/1/3/1/3/131384229/zaxumawadebogubazona.pdf
    • http://files.healingsunenergetics.com/uploads/1/3/0/8/130874134/lakebugi_juxovilit.pdf
    • http://files.lovethecloset.com/uploads/1/3/1/3/131381003/6576183.pdf
    • http://files.blmslibrary.org/uploads/1/3/1/6/131606644/ebdfe5.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9815/files/sefatipijifawenademu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/14617447709.pdf
    • https://cdn.shopify.com/s/files/1/0436/0817/8850/files/tegiji.pdf
    • https://cdn.shopify.com/s/files/1/0429/2273/7830/files/fovad.pdf
    • https://cdn.shopify.com/s/files/1/0432/8561/0654/files/5334736037.pdf
    • https://cdn.shopify.com/s/files/1/0432/7833/6165/files/zodevimepebapowufekolezoz.pdf
    • https://cdn.shopify.com/s/files/1/0438/1927/0301/files/nobejetin.pdf
    • https://cdn.shopify.com/s/files/1/0427/6705/7063/files/gupox.pdf
    • https://cdn.shopify.com/s/files/1/0433/9436/7644/files/81206520404.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7262/files/best_reader_app_for_iphone.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_off000087f6.bin
7955abc156268d0aa9f05d49662741eb73bdb4b57aefd81f8149c588cfd0a5f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x87F6 5184 bytes
font_01_sfnt_off000099a4.bin
e08fe01d6acc6f6c47837050539502b29e6cf56129d10ae9ec314367c7f03ca1
pdf-font-stream PDF embedded font (sfnt) at offset 0x99A4 10352 bytes