Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e407e832df1fc1…

MALICIOUS

PDF

51.0 KB Created: 2020-08-10 05:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe83e677b5230244918d6c0a6fa48665 SHA-1: 2635491fd865ed24d18b044cb015b980605c3b97 SHA-256: 03e407e832df1fc1930f78dfc10dd2a3f591c3de8b5031d85ffd18c35a873f11
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, includes text related to 'Lego architecture studio 21050 pdf' and a URL that appears to be a lure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly indicate a malicious intent to redirect users to 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.com/pify?keyword=lego+architecture+studio+21050+pdf
    • http://kujiwug.mittelmanassociatesarchitects.com/uploads/1/3/1/4/131410007/202841.pdf
    • http://files.dirkawalker.com/uploads/1/3/1/3/131380107/c7a8b.pdf
    • http://files.codyraycomposer.com/uploads/1/3/0/7/130739704/7117c.pdf
    • http://files.dennismoconnor.com/uploads/1/3/0/7/130775373/wexavafivapat-bumuz-gepokavinaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5337/4874/files/caryl_churchill_far_away.pdf
    • https://cdn.shopify.com/s/files/1/0434/2933/1100/files/juzupud.pdf
    • https://cdn.shopify.com/s/files/1/0434/5020/4316/files/power_factor_correction_using_capacitor_bank.pdf
    • https://cdn.shopify.com/s/files/1/0430/8425/1285/files/vovalajonutimize.pdf
    • https://cdn.shopify.com/s/files/1/0434/2297/4117/files/64998719523.pdf
    • https://cdn.shopify.com/s/files/1/0428/2246/7740/files/48834967016.pdf
    • https://cdn.shopify.com/s/files/1/0429/8440/7199/files/reading_passages_for_ielts_academic.pdf
    • https://cdn.shopify.com/s/files/1/0430/6498/3703/files/25240000146.pdf
    • https://cdn.shopify.com/s/files/1/0435/7246/1727/files/70041783766.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fa2.bin
99775ad759cedda7f32f5a5f5ca09375cd7913b396844ea46b6ebbae7407b5c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA2 5776 bytes
font_01_sfnt_off00008359.bin
cad29e0798674a29392ecc86ff69e9c5ecfb38577c3e0fe0e7c183b616366d07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8359 11144 bytes
font_02_sfnt_off0000a935.bin
6bc08458e5f7570499e11e5d6f8236234a40655bdd9bd9872dc8b60f0c79fb9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA935 16280 bytes

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