Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b935622bf516565…

MALICIOUS

PDF

48.6 KB Created: 2020-08-18 13:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5c55ee8c7cfd963af87c70e98d1fdcb SHA-1: 444bbeb09304536072ef679696d00af85be32fb1 SHA-256: 5b935622bf51656591ed2baa75e05e82c6ba618d62b565234dca049700607937
154 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, including one pointing to a known malicious redirector at `ttraff.com`. The document body, though heavily obfuscated, contains text related to 'creative writing skills pdf' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of many external PDF links further indicates a link farm or SEO manipulation tactic. No scripts were extracted, but the primary attack vector appears to be directing users to malicious infrastructure via embedded 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://ttraff.com/pify?keyword=creative+writing+skills+pdf
    • http://files.outstandinglibrarian.org/uploads/1/3/1/6/131636914/gazugus_zugokezinu_bapegusonulog.pdf
    • http://jupov.whoi.ca/uploads/1/3/0/8/130874359/xumabamotupen_bifukiwapanotak_forinenap_zaxazizajako.pdf
    • http://files.fotaburdur.com/uploads/1/3/0/7/130739253/telotosoted_buxajigifar_serasetowap_lukikotovulula.pdf
    • http://files.nolababyco.com/uploads/1/3/0/8/130873894/c931d1f226ed37b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/zelimapazarawubazugixabiz.pdf
    • https://cdn.shopify.com/s/files/1/0438/5816/5925/files/2012_jeep_grand_cherokee_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/9494/0575/files/agrarian_structure_under_mughals.pdf
    • https://cdn.shopify.com/s/files/1/0431/4021/9041/files/robozupute.pdf
    • https://cdn.shopify.com/s/files/1/0434/5187/5481/files/68572158464.pdf
    • https://cdn.shopify.com/s/files/1/0430/1216/1685/files/bollywood_video_songs_hd_free_2018.pdf
    • https://cdn.shopify.com/s/files/1/0431/6567/9776/files/pozowok.pdf
    • https://cdn.shopify.com/s/files/1/0433/0101/1611/files/11573831450.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/corrugated_roofing_sheet_cost.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vukabisozudetilo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7278/1478/files/77278433461.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/futevanivitazefiboledot.pdf
    • https://cdn.shopify.com/s/files/1/0432/8852/7013/files/ziforuzifo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1555/2672/files/53933435079.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_off00007feb.bin
69e519af54fac0cabcd552b1f95e313ace81282aa070e5dd0a1f433dd021a487		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FEB 5332 bytes
font_01_sfnt_off00009235.bin
c028e9475ed3518ae3eeaa3c53b5af57562a307ef981c808be9811d22a3fbb41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9235 10180 bytes

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