Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7d949d8ef6c09c…

MALICIOUS

PDF

61.1 KB Created: 2020-10-09 08:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 05dfb9536ab7f5bce593ddd72791a4fb SHA-1: 55ac268fecca8ecdd879e668566ea207563c51f1 SHA-256: 5b7d949d8ef6c09c793d1ef729c85266e85fd184ca2040009d3738a3e80d21f9
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including a link to a known malicious redirector, and a link to an algorithmically generated URL. The document body text, though heavily obfuscated, contains the phrase 'velocity banking spreadsheet download', suggesting a lure to trick users into clicking malicious links. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.club/pify?keyword=velocity+banking+spreadsheet+download In PDF document text
    • http://lixoxuxif.multidimensionalchromatography.com/uploads/1/3/1/3/131383914/rosij_zorelademe_sezemomi_xovived.pdfIn PDF document text
    • https://site-1043128.mozfiles.com/files/1043128/dasivepagitivuse.pdfIn PDF document text
    • https://site-1043794.mozfiles.com/files/1043794/73875451082.pdfIn PDF document text
    • https://site-1039449.mozfiles.com/files/1039449/92057587582.pdfIn PDF document text
    • https://site-1036962.mozfiles.com/files/1036962/nogamazogiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c28ac2f3-ff12-4636-819a-3ddcac896799/piruxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4debba7-e32d-4d17-b9e2-14181f9d7d88/87220087635.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f06bdcbf-d955-469d-80c7-6b0e96383235/fifivujotisosoluvepowele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df2c9820-3729-4460-99e9-c41dcc223f34/luvuvowodasigelomoduvop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e20dc27-3c3d-49e0-a6a5-1b1a01877302/vufarugakavotixogimigobap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78a39143-4529-46d9-a8c3-ee3e1bee2d04/94940219847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e77fbe3-f051-44b4-87f3-8b50b5ad429b/18792363672.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9842 2828 bytes
SHA-256: b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a
font_01_sfnt_off0000a23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA23D 5484 bytes
SHA-256: 5d29e8b3ab0193ee0abfad4c9db31dd8197eb8ff61d367808f62f48c150192f5
font_02_sfnt_off0000b4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E8 9868 bytes
SHA-256: 4910bccf41059bc824c74ba4489399e6b1738b057f7ad6436e40983e5760b7f5
font_03_sfnt_off0000d68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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