Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dea4aa95262b0b9…

MALICIOUS

PDF

60.3 KB Created: 2020-08-24 09:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89cb5a3e9bc55227e653cac665f9499a SHA-1: 799ec981563303040aa1d6b155cb3d4f89cb1856 SHA-256: 6dea4aa95262b0b9698097398415f49172471a6e4d0421de29262ca8afcc22c6
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to host other PDFs. One prominent URL, https://ttraff.ru/pify?keyword=management+and+organizational+behaviour+pdf+ou+syllabus, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other Shopify links, suggesting a lure to potentially malicious content. The ML classifier strongly supports the malicious verdict.

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=management+and+organizational+behaviour+pdf+ou+syllabus
    • http://files.bigfatpb.com/uploads/1/3/1/3/131380058/fecc54fad.pdf
    • http://files.fitnessaddictny.com/uploads/1/3/2/7/132712447/nogabuga.pdf
    • http://files.colangelowine.com/uploads/1/3/1/4/131454521/vogegomeguzugo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0433/9400/7191/files/kekizijokekosi.pdf
    • https://cdn.shopify.com/s/files/1/0461/9209/9477/files/brother_mfc_l2700dw_scanner_software.pdf
    • https://cdn.shopify.com/s/files/1/0431/5280/1954/files/18389709918.pdf
    • https://cdn.shopify.com/s/files/1/0430/4361/8965/files/86311191625.pdf
    • https://cdn.shopify.com/s/files/1/0437/6009/1287/files/fetasavamaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kevesuladufutaniwor.pdf
    • https://cdn.shopify.com/s/files/1/0434/2608/7064/files/kobubafow.pdf
    • https://cdn.shopify.com/s/files/1/0432/5025/3979/files/4985171818.pdf
    • https://cdn.shopify.com/s/files/1/0445/3544/7711/files/que_es_blended_learning.pdf
    • https://cdn.shopify.com/s/files/1/0433/3119/0952/files/liriz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40323832667.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/axis_bank_my_zone_credit_card_application_form.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006952.bin
0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6952 6744 bytes
font_01_sfnt_off00007a39.bin
6c139a2ed5bff06fa6b1796defc5de055b593b8c76603ef8c45dc7a471590eee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A39 5812 bytes
font_02_sfnt_off00008dec.bin
f5de210e3471e040d585125ee2cc8f46c152a6e09140449fb70e2c6c5b1749a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DEC 4996 bytes
font_03_sfnt_off00009f60.bin
d97e055e11de589539a249dfdf9c15aca1e9caf4700104d1763a3a5d87d8f7f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F60 2320 bytes
font_04_sfnt_off0000a9b2.bin
251d41a2822d0b7339e0c52a60b241b2d5948d8bb2a38db3fd14d0dab0c870aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9B2 10240 bytes
font_05_sfnt_off0000cd02.bin
207faf14306426b668b87aba0c9d447b8ba40b67f0f7b18660ffa0d3c8132265		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD02 16224 bytes

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