Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d281ce2f61f2c0…

MALICIOUS

PDF

43.4 KB Created: 2020-08-12 00:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93130a87d5e8742e7979d6cff077d75e SHA-1: 8f194dd18c3a2f6a15b653a0f0ade5098bf1bfd1 SHA-256: 11d281ce2f61f2c054864c7132a9f9678d50d87910d230161c5bf6926e9bdf68
190 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a critical finding for a redirector link to known malicious infrastructure. It impersonates a document signing service and includes a fake invoice lure, aiming to trick the user into clicking a link. The embedded link `https://ttraff.cc/pify?keyword=how+do+i+electronically+sign+a+pdf+on+my+ipad` is a primary indicator of this phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=how+do+i+electronically+sign+a+pdf+on+my+ipad
    • http://lijak.slcfaaa.com/uploads/1/3/0/7/130776208/4545642.pdf
    • http://vosipawu.baarleproeft.com/uploads/1/3/2/3/132302921/roxena.pdf
    • http://files.dogknows.co/uploads/1/3/1/3/131380612/eb4d7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7437/8142/files/72072599730.pdf
    • https://cdn.shopify.com/s/files/1/0432/7650/1148/files/swagger_api_testing_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/4780083199.pdf
    • https://cdn.shopify.com/s/files/1/0431/5371/9453/files/26331205601.pdf
    • https://cdn.shopify.com/s/files/1/0429/2725/9811/files/54059387263.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tosinumemelijigejidab.pdf
    • https://cdn.shopify.com/s/files/1/0429/2696/4903/files/20754398480.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xizijifopaxefiz.pdf
    • https://cdn.shopify.com/s/files/1/0447/8061/7885/files/cardinal_sarah_the_power_of_silence.pdf
    • https://cdn.shopify.com/s/files/1/0429/6228/8793/files/zalud.pdf
    • https://cdn.shopify.com/s/files/1/0435/3179/6629/files/method_of_applied_mathematics_book.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_off00006831.bin
fe02844ae8224daa4fb3ae72b3c902d445741e026c792c83b32b1ebf9c2c831a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6831 5632 bytes
font_01_sfnt_off00007b5b.bin
f9c5a52c6da7af88e542b35b42b0df7af35512c0aea979c6b55ccc7b02eb66e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B5B 10860 bytes

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