Malicious PDF — malware analysis report

Static analysis result for SHA-256 158aabf5167eaeb6…

MALICIOUS

PDF

58.2 KB Created: 2020-09-29 20:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62a14dfba5bed2802397d497b58a32ee SHA-1: b00472473f705281a67439e8d6ba82ea4920c741 SHA-256: 158aabf5167eaeb6066f4e33334dd5e5d7a8b94e67d59422a0bb77082910edea
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 redirector infrastructure designed to obscure the final destination. One prominent URL, https://gettraff.ru/strik?keyword=baylee+jae+book+pdf, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the same suspicious URLs, suggesting an attempt to disguise or obfuscate the malicious links.

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=baylee+jae+book+pdf
    • http://files.erdius.org/uploads/1/3/2/8/132814371/9652316.pdf
    • http://files.elementssalononline.com/uploads/1/3/0/8/130874143/422de05a6b.pdf
    • http://ruxik.cloakroomtheatre.co.uk/uploads/1/3/0/7/130739164/9357618.pdf
    • http://kubalov.nudosphynx.com/uploads/1/3/1/4/131453645/xaparumuxuvegis.pdf
    • https://site-1037149.mozfiles.com/files/1037149/64285024793.pdf
    • https://site-1036991.mozfiles.com/files/1036991/jumibe.pdf
    • http://pazuzexod.casaungherese.org/uploads/1/3/1/6/131637257/68e0b829e9a1a.pdf
    • http://files.santiagos.co.uk/uploads/1/3/2/6/132682785/morutajozodeme.pdf
    • http://bidovot.cffighters.org/uploads/1/3/0/9/130970004/6753457.pdf
    • http://files.imajicatheatrecompany.co.uk/uploads/1/3/0/7/130775229/xavabelufizudamowope.pdf
    • http://files.dorewe.com/uploads/1/3/1/3/131398542/8290615d9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1518/4290/files/finozenoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9786/files/dunufu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1123/4197/files/spell_of_the_sensuous.pdf
    • https://cdn.shopify.com/s/files/1/0437/8935/3117/files/25724078446.pdf
    • https://cdn.shopify.com/s/files/1/0437/5104/7329/files/18906650299.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_off00009809.bin
4994b0720073f12dcc10595362e7ad339f758b80fe58e0794864ec637108c267
pdf-font-stream PDF embedded font (sfnt) at offset 0x9809 5192 bytes
font_01_sfnt_off0000a9d8.bin
13d037de2e0e3753a9c1a41b42b8d54b99fe39709181fdc935ea1bb832307033
pdf-font-stream PDF embedded font (sfnt) at offset 0xA9D8 15652 bytes