Malicious PDF — malware analysis report

Static analysis result for SHA-256 457b041e93142a84…

MALICIOUS

PDF

40.1 KB Created: 2020-08-30 20:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dcf7d515efdbf093d2bba23771155e6 SHA-1: d912aa7cf0d4f4c6037a3404ebdd59af9fe26d07 SHA-256: 457b041e93142a84ad36dfb89ee6e1ffb738713209a5b1e6d90dbdc4d90709cf
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially garbled, includes text related to financial statements and the malicious URL, suggesting a lure to a phishing or malware distribution site. 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.com/wix?keyword=balance+sheet+owner%2527+s+equity+negative
    • https://cdn.shopify.com/s/files/1/0433/0412/4580/files/fidageduvunowav.pdf
    • https://cdn.shopify.com/s/files/1/0427/9658/1020/files/50883655927.pdf
    • https://cdn.shopify.com/s/files/1/0434/0740/9310/files/lelotuvij.pdf
    • https://static.usrfiles.com/ugd/d5cf39_d6d1586d4b3446f7b2cf7e8a88c9b6bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_2bf05d33aec643fbaf93c37a4d577458.pdf
    • https://cdn.shopify.com/s/files/1/0438/2874/0258/files/basilisks_osrs_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1096/files/mezudezatazeroxaki.pdf
    • https://cdn.shopify.com/s/files/1/0428/6713/0534/files/govizokawuti.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7924/files/research_design_and_statistical_analysis_in_christian_ministry.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15750122344.pdf
    • https://cdn.shopify.com/s/files/1/0429/6074/8695/files/bufir.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005eaa.bin
10206f5a16471f7d8ccccd9ec3a2cf1ac6f18a9f439a110f41167bde239e5e44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EAA 5524 bytes
font_01_sfnt_off0000718f.bin
1e7c644bed2137ac719aab6500afa4489263dddbb4ecaa1f8386972a205cc131		 pdf-font-stream PDF embedded font (sfnt) at offset 0x718F 10048 bytes

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