Malicious PDF — malware analysis report

Static analysis result for SHA-256 84403726905f913e…

MALICIOUS

PDF

32.0 KB Created: 2020-10-08 00:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ba891ae48b73488e7ada344775565f15 SHA-1: 6ac367e99fe31c3d26f3ba4537659511e3e4df45 SHA-256: 84403726905f913e102b9ecbdc52265093b0c127726934bfe3659f9e13a313f2
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the document body, though partially obfuscated, contains the redirector URL and other suspicious links. This suggests the document's primary purpose is to lure users to malicious sites.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/pify?keyword=forms+of+energy+worksheet In PDF document text
    • https://site-1038674.mozfiles.com/files/1038674/49827869762.pdfIn PDF document text
    • https://site-1040794.mozfiles.com/files/1040794/poxifoduzukojipebabupo.pdfIn PDF document text
    • https://site-1042884.mozfiles.com/files/1042884/siluvogozuf.pdfIn PDF document text
    • https://site-1042446.mozfiles.com/files/1042446/guvokulosokarapovabiwip.pdfIn PDF document text
    • https://site-1043130.mozfiles.com/files/1043130/siwukuxedivusi.pdfIn PDF document text
    • https://site-1038729.mozfiles.com/files/1038729/16506817180.pdfIn PDF document text
    • https://site-1036625.mozfiles.com/files/1036625/mibemuga.pdfIn PDF document text
    • http://files.richardsrobots.com/uploads/1/3/0/7/130738771/2a06e1.pdfIn PDF document text
    • http://files.alwayslovedal.com/uploads/1/3/1/4/131453818/1947619.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4631500-2664-432a-bf01-1a07734baa1b/dinifomew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a6f7bc0-2f3e-45ae-a73d-444d34a3d9fa/73281212505.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000041f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x41F2 5152 bytes
SHA-256: acf09b8a7b8f1db92c8a6b12161922abab08d1b3b565d07aaf0edb050c3f50c0
font_01_sfnt_off0000536f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x536F 9452 bytes
SHA-256: 7d44fe8518c156cd46f750aa3ec93062c5f3d7b2dad4e0539ed36777f89b3b18

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