Malicious PDF — malware analysis report

Static analysis result for SHA-256 33dee5abf2445bb0…

MALICIOUS

PDF

38.7 KB Created: 2020-09-18 19:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f7f6cf7171d3349aca5f02ec920c636 SHA-1: ea62ecf4928a52ac9e7024ec64096f060c9238d1 SHA-256: 33dee5abf2445bb0603b711940f00c92de3a61f0c1f63778e2b193f5ccb71a3a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, identified as a link farm, with one prominent link pointing to a known malicious redirector. The document body, though partially corrupted, contains text that appears to be a lure for users to click these links. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

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=macon+mayhem+home+schedule+2019
    • http://musezajad.pickmeflowersgifts.com/uploads/1/3/0/9/130969917/5aeadab4e8b.pdf
    • http://files.missdc.org/uploads/1/3/0/7/130775741/kosizivujolof.pdf
    • http://files.wellbeings-feelbetter.com/uploads/1/3/1/4/131437535/pajogudegiruzi.pdf
    • http://likazorir.langeconsulting.com.au/uploads/1/3/1/0/131070633/5307504.pdf
    • http://files.wanderlittles.com/uploads/1/3/1/3/131383892/kerepaxirid.pdf
    • http://sabetudu.mizunagardens.com/uploads/1/3/0/8/130814070/6651835.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dcc8e78b-a6f9-4264-b9b9-03400bd618b0.filesusr.com/ugd/595093_1f5f4ff120da4c4faa72b60840193808.pdf?index=true
    • https://b774ec38-d69d-4a30-88fc-0a919cc17ddf.filesusr.com/ugd/417718_086dc1c2c7bb4e7891915891a1f2337c.pdf?index=true
    • https://99753726-115b-4baa-b0b1-fec080eeabde.filesusr.com/ugd/dec231_4ee8c8eb1a6747a893cd03f2fb3cf231.pdf?index=true
    • https://a9bda2b3-adef-40b1-bd3f-ab0245885b1a.filesusr.com/ugd/45e30f_838cfc7793de469c8ff4f09b149b0a8b.pdf?index=true
    • https://d4ecf00d-aee8-4a7c-b78c-47ab4f9bb9d6.filesusr.com/ugd/67e251_fe26e3b997ed4a9a9864ec12d056471b.pdf?index=true
    • https://c73c5720-73f9-407c-9083-0e767d96d52c.filesusr.com/ugd/cc14e4_29c56db28be849a593b06cd6dd6636d2.pdf?index=true
    • 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_off000056d2.bin
9ed2a533f78fddb70a0e94bc8ca87f6745e0798a725f0691d93c7ad28e15c8d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x56D2 5672 bytes
font_01_sfnt_off00006a0f.bin
453e298205fe02872acfc9d9dfef2946bc163b21e79d4849a59b2ebc3ff5a58e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0F 10624 bytes