Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f2408177128772…

MALICIOUS

PDF

41.9 KB Created: 2020-09-04 01:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b57c8f95345454485b964bc03c63e88d SHA-1: 3400745a2d503cbaff06aa05a2bf9ce716d29b61 SHA-256: 81f24081771287722dd1f69b56592747f4906e4c3ba3da736aaa76c41fd204fb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/wix?keyword=apple+watch+android+notifications'. It also features a PDF link farm heuristic, indicating a large number of external links, with 'https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemulubu.pdf' being the first listed. The document body, though partially corrupted, contains text related to 'Apple watch android notifications' and the URL, suggesting a lure to trick users into clicking the malicious link.

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.link/wix?keyword=apple+watch+android+notifications
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemulubu.pdf
    • https://cdn.shopify.com/s/files/1/0439/4539/4331/files/curso_sobre_agricultura_biodinmica.pdf
    • https://cdn.shopify.com/s/files/1/0437/9649/6544/files/suspicious_activity_reports_sars_annual_report_2018.pdf
    • https://cdn.shopify.com/s/files/1/0440/8125/0469/files/wing_chun_all_techniques.pdf
    • https://static.usrfiles.com/ugd/405339_340091bdef5f4d55886edd2ff0db8a73.pdf
    • https://static.usrfiles.com/ugd/9ef0c3_e04b933e9eef402ca8bf1e6a45f55238.pdf
    • https://static.usrfiles.com/ugd/0adedf_0e25e07b6aab42aab9dc81d2951cc662.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_8efe91b1fe354a7dbf9570d113b9ef16.pdf
    • https://cdn.shopify.com/s/files/1/0438/4056/9509/files/gulowewujivipukujuno.pdf
    • https://cdn.shopify.com/s/files/1/0429/2762/0249/files/niviz.pdf
    • https://cdn.shopify.com/s/files/1/0435/1596/9688/files/autotransformer_starter_for_induction_motor.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000663d.bin
e1417978fdf2a7ff6a45a168e0a1fa12bf91a16d665aea0521d1711303b231e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x663D 5324 bytes
font_01_sfnt_off00007865.bin
4d3f3ff746c66b20338f00e04df1fc1cb6573d5ac2a711277343d081b50f1efd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7865 10112 bytes