Malicious PDF — malware analysis report

Static analysis result for SHA-256 033fb8a4ca3c6f31…

MALICIOUS

PDF

42.4 KB Created: 2020-09-12 04:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1aa4e2e71a0ff9c3df7f13bacc15745f SHA-1: 255caa9b97a82073557b218b6809704f2e9d2597 SHA-256: 033fb8a4ca3c6f31daee95140a0e80d9c1a444071c922b39e6bf9f65e9efc542
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'petty cash book pdf' and the wkhtmltopdf application, suggesting a lure to disguise malicious content. The presence of a malicious redirector and a link farm indicates an attempt to drive traffic to potentially harmful 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 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=types+of+petty+cash+book+pdf In PDF document text
    • http://files.engineeredathletes.com/uploads/1/3/0/8/130874641/xigojafesovomalof.pdfIn PDF document text
    • http://files.thebotanyscholar.com/uploads/1/3/0/7/130775384/e86badbf2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/8127dd_bb552224189a441ea054e27f2b532ac6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3615fb_1cacc76fbadc4062b0df0cc68f4de534.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b85eb0_e749c20739d1476daa870c3136e0022f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e948c1_04b37bc6b93d41a5b40c4c6b94a35976.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f515ca_64e6a3d508dc4684813734c5b7040d67.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/405339_af4c1d7c20004e0e962a3c9e98c6b323.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/32acb1_5b67fd1ee62e429c8bc59364a8a64c76.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/238140_7b8b5dfe3fd043e795d07bc54833d058.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/120874_3b22899bb3ac4203a2db469160075b1e.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_off000068bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68BC 5372 bytes
SHA-256: 7730c65ab2dcb0c6471c3554bd0aa78cf818bd87225e941a8f4f67d16eaf17aa
font_01_sfnt_off00007b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B06 10088 bytes
SHA-256: 8ac5839f5b83fdb9af0e353c6158fb544cd4f69f7a60aff88ade25b2050e7d13

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