Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b9c843c960f56f6…

MALICIOUS

PDF

37.3 KB Created: 2020-08-19 13:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: def31afcf072fa0e8e540ec954a108ec SHA-1: 2b627538a25bf0712fcd0f9f8846b662ca6e5bc1 SHA-256: 6b9c843c960f56f682aaf040a85b4d539157431292eed441f31ea7b32be6a25a
162 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL and appears to be a lure for a 'lab report'. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many of which are benign but serve to obscure the malicious one. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious verdict.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=lab+report+grignard+reaction
    • http://files.vickiaskew.com/uploads/1/3/1/3/131398085/2173766.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/4038/0840/files/89821841494.pdf
    • https://cdn.shopify.com/s/files/1/0435/5905/9615/files/pm_awas_yojana_form_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/8138/4604/files/luxeterod.pdf
    • https://cdn.shopify.com/s/files/1/0445/6503/7220/files/blade_master_mod_apk_unlocked.pdf
    • https://cdn.shopify.com/s/files/1/0428/5143/4652/files/ncert_class_12_accountancy_part_1.pdf
    • https://cdn.shopify.com/s/files/1/0428/1185/0918/files/19864858011.pdf
    • https://cdn.shopify.com/s/files/1/0433/2650/5118/files/57477933763.pdf
    • https://cdn.shopify.com/s/files/1/0434/6193/5261/files/35380124684.pdf
    • https://cdn.shopify.com/s/files/1/0428/1306/3335/files/4778643602.pdf
    • https://cdn.shopify.com/s/files/1/0448/4608/8349/files/try_catch_c.pdf
    • https://cdn.shopify.com/s/files/1/0429/5966/7363/files/sales_qualification_process.pdf
    • https://cdn.shopify.com/s/files/1/0439/5096/4904/files/oxigeno_y_radicales_libres.pdf
    • https://cdn.shopify.com/s/files/1/0430/4168/5665/files/sacoche_longchamps_pas_cher.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005570.bin
53d4ac9d26e19306e2195334b57d2939f460de601596432f427cec36687f5196		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5570 5112 bytes
font_01_sfnt_off000066dc.bin
f8ae0166c323b7c86e66bdc6e91e18eea3cddbe7d2ab4f3a43a0873ce559063d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66DC 9868 bytes

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