Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f5461d6ebf3069…

MALICIOUS

PDF

42.0 KB Created: 2020-08-21 13:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9c9cec0a379e82a3e838a77431034fc SHA-1: 1b1a99c422ad50b91e82ed73c10fcbad95830371 SHA-256: 02f5461d6ebf3069198f203a8a2140403679b1490f4cfef9cbbf7ab8e8977df4
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document body, though partially corrupted, suggests a lure related to financial documents. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious.

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.cc/pify?keyword=blank+cash+drawer+count+sheet
    • http://sobokasob.dosterleadershipconference.com/uploads/1/3/1/1/131164250/giwotu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/9155/6504/files/telomirumamodirim.pdf
    • https://cdn.shopify.com/s/files/1/0436/9616/0923/files/episode_guide_blacklist_season_3.pdf
    • https://cdn.shopify.com/s/files/1/0428/3046/3135/files/kanemunewasogifidelotogal.pdf
    • https://cdn.shopify.com/s/files/1/0433/3201/0152/files/zaxatifelaposuku.pdf
    • https://cdn.shopify.com/s/files/1/0430/9578/5629/files/wijumivejuzupupejirenes.pdf
    • https://cdn.shopify.com/s/files/1/0429/7284/0090/files/bipep.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1669/files/sesefanesatevebopoxepupe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/fundamental_of_structural_analysis_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/6550/8002/files/2241109282.pdf
    • https://cdn.shopify.com/s/files/1/0450/0983/0046/files/63466829018.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b33.bin
8c9b0d7a10d44a4bb21c205b9407fc6ca8eb7009199f462b14f431286b6729bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B33 5064 bytes
font_01_sfnt_off00006c6c.bin
b4b0b42ad145fb508f43647a27fb476d32f52368aa096242b5db8d9d08a4b5e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6C 9720 bytes
font_02_sfnt_off00008d99.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D99 4324 bytes