Malicious PDF — malware analysis report

Static analysis result for SHA-256 8430dd572888a9e8…

MALICIOUS

PDF

48.2 KB Created: 2020-08-07 14:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9505f571a3893e45098f10e34afff16d SHA-1: 3cce2b150495aceedaced9b9e8625bacb1cb78c1 SHA-256: 8430dd572888a9e837c9b40ad7ede2a43b74b7c6b64b25cbea8c754ed2d8d643
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links, with one specifically identified as a malicious redirector. This suggests the document's primary purpose is to lure users to malicious websites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of the specific lure.

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/pify?keyword=karmasandhan+bengali+newspaper+this+week+pdf
    • http://files.hbnaz.org/uploads/1/3/1/3/131383283/cf3401ee5.pdf
    • http://files.diannesk9connection.com/uploads/1/3/2/6/132695749/9dae20aeadd21.pdf
    • http://files.mechanicalairconcepts.com/uploads/1/3/1/8/131871778/7873092.pdf
    • http://files.kathrynsantaphotography.com/uploads/1/3/0/7/130775635/kuvezurirafapix.pdf
    • http://files.rhondastruminger.net/uploads/1/3/1/0/131071076/1562942.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0445/9456/1188/files/cdl_practice_test_nj.pdf
    • https://cdn.shopify.com/s/files/1/0432/1997/6350/files/honda_civic_2020_manual_uk.pdf
    • https://cdn.shopify.com/s/files/1/0435/8940/2783/files/alan_greenspan_biography.pdf
    • https://cdn.shopify.com/s/files/1/0430/1104/7575/files/rabagolumokegekorikatota.pdf
    • https://cdn.shopify.com/s/files/1/0433/9440/0414/files/31766208035.pdf
    • https://cdn.shopify.com/s/files/1/0430/3467/3305/files/87389798482.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37237973095.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/spiked_boots_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0432/4445/4056/files/xafapajura.pdf
    • https://cdn.shopify.com/s/files/1/0435/8035/8815/files/43604402176.pdf
    • https://cdn.shopify.com/s/files/1/0434/5298/9607/files/pdf_assembler_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/0819/6767/files/basic_english_conversation_lessons.pdf
    • https://cdn.shopify.com/s/files/1/0433/8951/7973/files/negefalabukurumo.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_off0000663e.bin
8fa1ed00a048b206df112155a9470522be2cb6dbe0cc1732b8a05dea0b7a99d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x663E 5400 bytes
font_01_sfnt_off00007870.bin
875e06b20a0a6595316e3bd3466d8e76d897db389047a8ff2148e4a6c7f5e49c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7870 14640 bytes
font_02_sfnt_off0000a57f.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA57F 4324 bytes

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