Malicious PDF — malware analysis report

Static analysis result for SHA-256 7694499cc275982c…

MALICIOUS

PDF

54.7 KB Created: 2020-08-31 11:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ff0dd8e77f8ac2e742d8ffc31cd4126 SHA-1: dae68aed9bc074e1d852ca4db0aa8a1f11ed437b SHA-256: 7694499cc275982cffd873302bd6de30758e46330031b8d5067a1623fc68bf44
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.com/wix?keyword=christi+lukasiak+mother'. Additionally, it exhibits a PDF link farm heuristic, indicating a large number of outbound links, many of which point to benign PDF files. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL.

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.com/wix?keyword=christi+lukasiak+mother
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/83d902_062da2795ca94c06a400af0467da83e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7a6cfca65204dce83d680068a15a65a.pdf
    • https://static.usrfiles.com/ugd/6116da_173199be646a4e529af91f17052b234e.pdf
    • https://static.usrfiles.com/ugd/902d29_1d584aa744b945a2b875be8ef6fa0636.pdf
    • https://static.usrfiles.com/ugd/0049ca_5c3c7e0501ce40f4a1dfe0089d111926.pdf
    • https://cdn.shopify.com/s/files/1/0435/2521/0263/files/47402819937.pdf
    • https://cdn.shopify.com/s/files/1/0431/3051/9716/files/bioplastic_from_milk.pdf
    • https://cdn.shopify.com/s/files/1/0437/8315/9957/files/66847314196.pdf
    • https://cdn.shopify.com/s/files/1/0438/3942/2624/files/navigation_bar_apk_android_2._3.pdf
    • https://cdn.shopify.com/s/files/1/0432/6952/1568/files/74609055784.pdf
    • https://cdn.shopify.com/s/files/1/0432/9163/9966/files/92469451272.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3041/files/nedis.pdf
    • https://cdn.shopify.com/s/files/1/0432/1817/4120/files/bouddhisme_pour_les_nuls.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/meragavafeduxilaxopuxaw.pdf
    • https://static.usrfiles.com/ugd/808d8c_496a10c6b778400a84628fa9cd5ed11a.pdf
    • https://static.usrfiles.com/ugd/756799_51bff4c5efad4fd18e1589c7183a9847.pdf
    • https://static.usrfiles.com/ugd/36f25b_7f287c2a1cad4c6e8375743b3b5bf70a.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_off00009781.bin
6b77bc94c93ca26c7d549ff8108d255cdc2cee17e37f530d97c5f05e3c433e83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9781 4896 bytes
font_01_sfnt_off0000a7fb.bin
81b18e2c2b5f3ce3d4e08136897b8d4f7b065b43bdab52ea24e4e285ef43bb11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7FB 10764 bytes

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