Malicious PDF — malware analysis report

Static analysis result for SHA-256 733e280fc51bc8c1…

MALICIOUS

PDF

57.7 KB Created: 2020-08-07 01:39:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83d9daa506e14fdb3176a084551c2d0a SHA-1: 3b1cda58dadb60969c9515d6f6140f19b594227b SHA-256: 733e280fc51bc8c1fafbce54b48607ea6e39020a466a82d1b9712a2c2b605dfd
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files, forming a link farm. One prominent URL, 'https://ttraff.ru/pify?keyword=games+of+thrones+map+pdf', is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. The document's structure and embedded links suggest it is designed to redirect users to potentially harmful content.

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.ru/pify?keyword=games+of+thrones+map+pdf
    • http://tatexa.sacredvesselacupuncture.com/uploads/1/3/1/6/131607163/zoligageg_zebumedireguzam.pdf
    • http://files.aopsecondaryarts.org/uploads/1/3/0/7/130739802/jukepirefefovujesilu.pdf
    • http://files.walkshop.org/uploads/1/3/0/8/130873794/20b98a5.pdf
    • http://files.aoh-patrickryandivision.org/uploads/1/3/0/8/130874633/4276044.pdf
    • http://dogozazij.anammai.com/uploads/1/3/0/7/130739693/rijagaviten-fugelupugik-kivowerubugamu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/nemuxevo.pdf
    • https://cdn.shopify.com/s/files/1/0440/9825/7048/files/43863716490.pdf
    • https://cdn.shopify.com/s/files/1/0430/1075/2663/files/the_gamer_manhwa.pdf
    • https://cdn.shopify.com/s/files/1/0436/9917/5579/files/luvib.pdf
    • https://cdn.shopify.com/s/files/1/0430/7392/9378/files/ziwojirega.pdf
    • https://cdn.shopify.com/s/files/1/0428/1643/8438/files/49717839400.pdf
    • https://cdn.shopify.com/s/files/1/0430/7025/9357/files/lukinanufugijegojab.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8988/files/tomoziferirodajezuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/consultoria_e_diagnostico_empresarial_anelio_berti.pdf
    • https://cdn.shopify.com/s/files/1/0433/4649/3605/files/autoimmune_hepatitis_diet.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_off000095bc.bin
2a8cebce236a6292321f7c0697460809c5e9f4bbee9f1f7c241de40f0f98b6bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95BC 5020 bytes
font_01_sfnt_off0000a6a7.bin
0af2ae4a6c4c559dce1d5edd1de886cc78df91d7dc31f53871f570539d5338f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6A7 10748 bytes
font_02_sfnt_off0000cb68.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB68 4324 bytes

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