Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c882da4393c63b…

MALICIOUS

PDF

42.3 KB Created: 2020-08-31 20:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10665baf6c60ced9993d48eee7877c60 SHA-1: 12c4e8d946f3846e1afe9cc166880ca6f58d8fbe SHA-256: b9c882da4393c63ba1d3341b4f71892402930fb5e714b17833660b2d8c7c5edc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'volunteer application form' and includes the malicious URL, suggesting a lure to trick users into clicking the link. 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://ttraff.com/wix?keyword=bc+spca+volunteer+application+form
    • https://cdn.shopify.com/s/files/1/0435/4598/5179/files/git_reset_all_changes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rikakaxudote.pdf
    • https://cdn.shopify.com/s/files/1/0436/6961/8841/files/sample_bio_data_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/8155/5350/files/welakalalidudu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7904/files/80019662812.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f5af9fc666d4ff7b153b045a1a384ba.pdf
    • https://static.usrfiles.com/ugd/eb5a6a_f45102d8bfed481a8e27f004e9eaac6b.pdf
    • https://static.usrfiles.com/ugd/dd4472_845cc286d2534f0dbb1257cbd014ff8d.pdf
    • https://static.usrfiles.com/ugd/b8c837_8ae09c91c8cc4626ab9f9556302f8930.pdf
    • https://static.usrfiles.com/ugd/1f5cef_e96fc30a8ef64d02b8fbc3ee69a8e761.pdf
    • https://static.usrfiles.com/ugd/b8c837_e92078842fa141ccbf09640afcee7c59.pdf
    • https://static.usrfiles.com/ugd/5a1791_de46242aad4b4826b2bd8fb12324ba9b.pdf
    • https://cdn.shopify.com/s/files/1/0432/0896/6306/files/vibijiduvibosagusam.pdf
    • https://cdn.shopify.com/s/files/1/0427/9838/3260/files/posivurewuzejasag.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_off000067a7.bin
6dd21c3e33b31197be37077c8393577fad070eb0228ad520c6fbba824a9c63a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x67A7 5268 bytes
font_01_sfnt_off0000798b.bin
20930e05af07022570516e3775d89e5ee9c093b0a055ea3b0f8ede111925de39
pdf-font-stream PDF embedded font (sfnt) at offset 0x798B 10184 bytes