Malicious PDF — malware analysis report

Static analysis result for SHA-256 d436bc480e0596f3…

MALICIOUS

PDF

44.1 KB Created: 2020-08-29 06:39:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29efee7ac27c92ee6abbc63d5ccf6394 SHA-1: 27cd37babed006cc7f78e102722af1987af31b8d SHA-256: d436bc480e0596f3bf704ebfae66ccf38d4ad40d67ae5dc2eba44359de8f0659
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a deceptive "Book review outline" to entice users to click on a malicious redirector URL. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM firings indicate the document's primary purpose is to redirect users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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/wix?keyword=book+review+outline
    • https://cdn.shopify.com/s/files/1/0435/1400/3610/files/46439573898.pdf
    • https://cdn.shopify.com/s/files/1/0435/7668/8798/files/powokotaruwetuxurag.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7922/files/75502966772.pdf
    • https://cdn.shopify.com/s/files/1/0434/7808/9878/files/rudunob.pdf
    • https://cdn.shopify.com/s/files/1/0429/7129/9999/files/45795613741.pdf
    • https://cdn.shopify.com/s/files/1/0437/5481/5640/files/fexukopikigarazifovesogij.pdf
    • https://cdn.shopify.com/s/files/1/0436/3301/6982/files/2023307462.pdf
    • https://static.usrfiles.com/ugd/b8c837_38281d21d2b74252840743180cf1cba7.pdf
    • https://static.usrfiles.com/ugd/b8c837_952c9e519d27476991ef637a1542fd49.pdf
    • https://static.usrfiles.com/ugd/b8c837_123168eff3ff4dfcaa9395970eea02cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_1089c6a8614948b79ff195f8fdd50e4e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006448.bin
d78480a599a45791814182bc87f5b737fab2316087eb89953188f24aabf9034e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6448 4440 bytes
font_01_sfnt_off00007380.bin
9d2264cb70c41a2b661a7fa034f22e13ed2a0da824119e42519e37292fa3eaaf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7380 10076 bytes
font_02_sfnt_off00009606.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9606 4324 bytes