Malicious PDF — malware analysis report

Static analysis result for SHA-256 14ca8ee1fca412fa…

MALICIOUS

PDF

48.5 KB Created: 2020-08-29 20:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbab22121e874d496eec50ad09020ab1 SHA-1: 3899905e22614f342650f89291e22322c466b823 SHA-256: 14ca8ee1fca412faeb89a05048a70b7138a996ecc94af147fbea1614d2356dd8
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL, suggesting an attempt to lure users to malicious content, likely for further exploitation or phishing.

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.cc/wix?keyword=unblocked+rap+music+sites
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_a6c34eea607d423bbeb400693806f6c4.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2fc6cd70c384a0e9e48bd6a30147b34.pdf
    • https://static.usrfiles.com/ugd/b8c837_31862c9f39b64637ba7bac4ac87c4ad1.pdf
    • https://static.usrfiles.com/ugd/79cb75_a065a3d5ff9e4304af3ddd25e0fa98d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_6366f00460ca466b9f98981ffee03785.pdf
    • https://cdn.shopify.com/s/files/1/0434/7484/5858/files/marshall_acton_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/8323/5489/files/11367260204.pdf
    • https://cdn.shopify.com/s/files/1/0431/0564/8801/files/kigubekufisedididukagono.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/88085723249.pdf
    • https://cdn.shopify.com/s/files/1/0438/4977/7312/files/88828281604.pdf
    • https://cdn.shopify.com/s/files/1/0436/9825/8088/files/passport_application_for_minors.pdf
    • https://cdn.shopify.com/s/files/1/0430/9535/9642/files/geboxatadixuxada.pdf
    • https://cdn.shopify.com/s/files/1/0429/8860/1503/files/davuroxiwomemelegefilavim.pdf
    • https://cdn.shopify.com/s/files/1/0434/7212/6117/files/askep_caput_succedaneum.pdf
    • https://cdn.shopify.com/s/files/1/0432/7102/8896/files/pokemon_go_nest_migration.pdf
    • https://cdn.shopify.com/s/files/1/0429/6084/7007/files/32431741662.pdf
    • https://cdn.shopify.com/s/files/1/0434/0695/0558/files/xovunujimuwamakatuxe.pdf
    • https://cdn.shopify.com/s/files/1/0429/0940/1251/files/91348980841.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_off00007c4a.bin
84864118fba8c89d2aef5c791db47016882cd72352be4863e8fa0838b26dd648		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C4A 5416 bytes
font_01_sfnt_off00008e8f.bin
b2650e695ba2c5be09698e66819fcdff4027d1932885c2e3257664cbc3be8335		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E8F 11792 bytes

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