Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b389330ae27e54…

MALICIOUS

PDF

48.8 KB Created: 2020-10-02 01:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e9e91b90a1bcd5ed806dcfd61d66ecb8 SHA-1: 946e1c2c229d3ace1614a75ca7def43cbcc89981 SHA-256: c6b389330ae27e54414c07104aaf692caa9f49386c17c53bc37df3a87fb92082
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious URL, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text suggesting a lure related to a "Zoo craft hack apk mod". The presence of numerous external PDF links, as flagged by 'PDF_SEO_LINK_FARM', indicates a link farm strategy to distribute malicious content. The ML classifier also strongly indicated maliciousness.

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://gettraff.ru/strik?keyword=zoo+craft+hack+apk+mod In PDF document text
    • https://site-1037106.mozfiles.com/files/1037106/nubugib.pdfIn PDF document text
    • https://site-1038439.mozfiles.com/files/1038439/votipafuzokowolewugum.pdfIn PDF document text
    • http://kizijezu.monstacartoons.com/uploads/1/3/2/3/132303382/kabaka.pdfIn PDF document text
    • http://lelam.rhymebaby.com/uploads/1/3/0/7/130739978/9552527.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7241/2055/files/gekajezevigixirata.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5159/5429/files/64300918040.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1415/9521/files/another_word_for_honestly_speaking.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5520/0918/files/drugs_society_and_human_behavior_17th_edition__version.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/the_shadow_of_the_torturer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8251/3561/files/zombie_train_unblocked_hacked.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60A6 4724 bytes
SHA-256: 58b1904a8baa946ae8c9a4ccfa9d871061f8f1d3abf5c89cbe30af40adc43275
font_01_sfnt_off000070a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70A8 10092 bytes
SHA-256: 29edcb725747cfc1e79fe4cd4a532d6f2643b1fc66a7f01f56a6b8daaadfaacf
font_02_sfnt_off00009359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9359 16160 bytes
SHA-256: 9ffc405fbed68b1ed35cf25504b2a045b5802e2074cf99e6920a228075e829fc
font_03_sfnt_off0000a85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA85F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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