Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8f8d44f1fd86af…

MALICIOUS

PDF

42.9 KB Created: 2020-09-17 05:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccff2fc7a7b2dbe65e0359116cd5b959 SHA-1: 63a8e02611a033ea9954bb90f469d22a3d7aad41 SHA-256: 0f8f8d44f1fd86af7703e940594a30ab67e352075d6545b8e8af573d84977615
154 Risk Score

Malware Insights

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

This PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm designed to manipulate search engine results or lure users to malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. 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.me/wix?keyword=del+amor+y+otros+demonios+pdf+google+drive
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/1795/3702/files/jerry_kuhnhausen_shop_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/5461/2123/files/74912049506.pdf
    • https://cdn.shopify.com/s/files/1/0435/4641/1162/files/94871182465.pdf
    • https://cdn.shopify.com/s/files/1/0459/2238/6069/files/85615524608.pdf
    • https://cdn.shopify.com/s/files/1/0431/4978/7285/files/game_android_1_mod_apk_offline.pdf
    • https://cdn.shopify.com/s/files/1/0434/4230/7239/files/jetson_tx2_module_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/teviligesumepefuvo.pdf
    • https://cdn.shopify.com/s/files/1/0483/2611/5481/files/dd_3.5_bone_knight_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0440/1207/7206/files/asme_ansi_b16._5.pdf
    • https://cdn.shopify.com/s/files/1/0429/0274/9347/files/67876179589.pdf
    • https://cdn.shopify.com/s/files/1/0439/3402/3848/files/human_physiology_by_sembulingam.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3384/files/all_types_of_application_letter_format.pdf
    • https://cdn.shopify.com/s/files/1/0435/4624/7332/files/ruxakirekagosukubuzegato.pdf
    • https://cdn.shopify.com/s/files/1/0450/9014/4421/files/factoring_trinomials_worksheet_coloring_activity.pdf
    • https://cdn.shopify.com/s/files/1/0435/7573/8527/files/99343747900.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_off00005965.bin
dde5f8e4e8e347ca87f407a895a85c111ea56dc0467696722033beff797d346d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5965 5308 bytes
font_01_sfnt_off00006b74.bin
f90dc29badb4082f030defb2a8edb0ced4767cb4c3b54f30f53184b543d20356		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B74 10668 bytes
font_02_sfnt_off00008e93.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E93 4324 bytes

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