Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4cb3adec56334f…

MALICIOUS

PDF

51.1 KB Created: 2020-08-25 17:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99aebcff6d62f53e03edbcd799615867 SHA-1: bb32ec5389bdad001f02d71ddc1a17e64d76053f SHA-256: 0a4cb3adec56334f25f3d9d2d203b2eedc6c5ba061a556a288da1de9fffd6a89
194 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the document is designed to lead the user to malicious content, likely a phishing or scam page, as indicated by the 'SE_PAYMENT_REDIRECT_LURE' heuristic.

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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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=calculator+apk+lock
    • http://files.darrenwilson.net/uploads/1/3/1/4/131437149/tikazojezazeb_vomoru_sisego_xaxamifitepo.pdf
    • http://retamanos.jagartsupply.com/uploads/1/3/0/7/130776485/jafufitaro-jumegafizuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/mibujenufomisit.pdf
    • https://cdn.shopify.com/s/files/1/0435/1184/0927/files/check_stub_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/kazemawapelesomavur.pdf
    • https://cdn.shopify.com/s/files/1/0428/2862/8124/files/exemple_de_cahier_de_charge_d_un_projet_de_construction.pdf
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/nakiwufivum.pdf
    • https://cdn.shopify.com/s/files/1/0431/2023/0564/files/99627922475.pdf
    • https://cdn.shopify.com/s/files/1/0432/3452/5347/files/63639886581.pdf
    • https://cdn.shopify.com/s/files/1/0433/6048/5541/files/2139172600.pdf
    • https://cdn.shopify.com/s/files/1/0428/9911/2095/files/nifevuxudopet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/juzopuzenafososokazulu.pdf
    • https://cdn.shopify.com/s/files/1/0436/2852/7776/files/devovewomezojategap.pdf
    • https://cdn.shopify.com/s/files/1/0430/9729/2949/files/calendario_settembre_2020.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006222.bin
1a48035aa79360a291821ead2adf46041bf71660ca222855dd3dc5e4c8df228a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6222 4716 bytes
font_01_sfnt_off00007230.bin
475b3b2b4b6dceb45d67124da0c2d3bf2c461cdb9507e4186534c68d2fc3c809		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7230 4896 bytes
font_02_sfnt_off000084cb.bin
a105c6848f89397ea3e903eee85bdb91d8c4c28fee374ccd1008fb62ad0f8955		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84CB 10128 bytes
font_03_sfnt_off0000a795.bin
eb53fb7c0af7dfceca6e44b412a0c540fafeb489b29d8315e74e535ecf6ad472		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA795 16844 bytes

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