Malicious PDF — malware analysis report

Static analysis result for SHA-256 e268689b1a5b05b4…

MALICIOUS

PDF

38.8 KB Created: 2020-08-19 11:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3fb07ef1c1f88cf5dc19f83aff506c6 SHA-1: 8d488837d75ba8667da426edf477f5e69a9083d3 SHA-256: e268689b1a5b05b41b243a6423ba7b8e2993284c2af65417f9d189eabad9f77c
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link, disguised as a solution for an Excel issue, which leads to the URL https://ttraff.cc/pify?keyword=make+excel+spreadsheet+not+read+only. This URL is part of a link farm designed to attract traffic. The ML classifier strongly indicated maliciousness, and the presence of numerous embedded links further supports a malicious intent to redirect users to potentially harmful content.

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=make+excel+spreadsheet+not+read+only
    • http://files.grandeprairierugby.com/uploads/1/3/2/7/132740838/robixarew.pdf
    • http://vituki.tadrisacademics.com/uploads/1/3/1/4/131406390/wiwitomuki.pdf
    • https://cdn.shopify.com/s/files/1/0437/1739/4586/files/54049680423.pdf
    • https://cdn.shopify.com/s/files/1/0430/3673/7699/files/15593111922.pdf
    • https://cdn.shopify.com/s/files/1/0448/0489/8978/files/antenatal_care_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1129/2829/files/ak_47_parts_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0219/files/zupafoge.pdf
    • https://cdn.shopify.com/s/files/1/0433/9151/6826/files/management_a_practical_introduction_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0440/8537/9237/files/steam_link_raspberry_pi_performance.pdf
    • https://cdn.shopify.com/s/files/1/0437/6897/1415/files/dazivogosi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4960/7590/files/93997934878.pdf
    • https://cdn.shopify.com/s/files/1/0429/5560/4134/files/78896267971.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_off000059a7.bin
2a4a1d9fb0e468724de86087970ba24df4b79cebf131a7f75709b0aeb489e6e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x59A7 5400 bytes
font_01_sfnt_off00006c0e.bin
8e8b1ade6709c886b497e03130a9ab0856025adb2b8dfc35f5fcbdb8fc09e3df
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C0E 10112 bytes