Malicious PDF — malware analysis report

Static analysis result for SHA-256 7694f80fb32f632f…

MALICIOUS

PDF

47.4 KB Created: 2020-08-18 20:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71c365f7f357492b11c4a4a620cae329 SHA-1: 8a1a49aa46a63926ff73d64ae3a3efe69068ba05 SHA-256: 7694f80fb32f632fd1e18983400adbef9337ef3eb8c991a162986d48cd211f96
182 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially garbled, includes text related to 'invoice template for services', aligning with the 'SE_INVOICE_LURE' heuristic. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.ru/pify?keyword=sample+invoice+template+for+services
    • http://bewuzupug.molim.net/uploads/1/3/1/4/131406387/0f99804.pdf
    • http://bizobo.sideporchhandmadesoap.com/uploads/1/3/1/3/131380397/9937334.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/5969/8077/files/vavabivor.pdf
    • https://cdn.shopify.com/s/files/1/0429/2683/3823/files/call_and_put_options_examples.pdf
    • https://cdn.shopify.com/s/files/1/0432/0316/6369/files/zexirikod.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/equidad_de_genero_ensayo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4325/8522/files/36395734445.pdf
    • https://cdn.shopify.com/s/files/1/0430/2353/2195/files/20419997367.pdf
    • https://cdn.shopify.com/s/files/1/0438/6465/3984/files/56437769095.pdf
    • https://cdn.shopify.com/s/files/1/0435/4605/0728/files/vivegagimezumobe.pdf
    • https://cdn.shopify.com/s/files/1/0431/5863/4658/files/68094185438.pdf
    • https://cdn.shopify.com/s/files/1/0434/1520/8098/files/25765948919.pdf
    • https://cdn.shopify.com/s/files/1/0432/9547/3822/files/xilifopi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9163/9968/files/excel_macro_vlookup_from_another_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/6297/6921/files/castellano_o_espaol.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f05.bin
2a6fe52b213cdd7f63e16072f18d03ca1147db118bdcea3ad17928faba5225f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F05 5112 bytes
font_01_sfnt_off00008045.bin
b8b1fc3d3edc4cd86bd90c1c81e8d18e444a4e5219b704c95e754842adb55413		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8045 10128 bytes
font_02_sfnt_off0000a2d7.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2D7 4324 bytes

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