Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef78f25db42d8ed0…

MALICIOUS

PDF

53.5 KB Created: 2020-08-30 00:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f8d4995659e33e3437abe8abeef209c SHA-1: 8c88ec17ca807b5846348f655c709b80831f6c90 SHA-256: ef78f25db42d8ed0732c7f2cfa042812139c4f16675b9daa34aa74503415d9e1
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious content, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The primary malicious URL identified is https://ttraff.link/wix?keyword=the+rise+of+absolute+monarchs+worksh. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the analysis of the exact payload delivery mechanism.

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.link/wix?keyword=the+rise+of+absolute+monarchs+worksh
    • https://cdn.shopify.com/s/files/1/0435/5457/0399/files/38414603048.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lorirazapevimixawas.pdf
    • https://cdn.shopify.com/s/files/1/0435/6187/7663/files/fundamentals_of_anatomy_and_physiology_11th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/4017/7308/files/zizigiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/4783/0183/files/94838037523.pdf
    • https://static.usrfiles.com/ugd/b8c837_acd2b21d711d485d93ff7233026187c3.pdf
    • https://static.usrfiles.com/ugd/b58d21_1d30cc1a20ea429086c39c68292213ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c1c2a3713ab43eab5e5e0d28b856f2c.pdf
    • https://static.usrfiles.com/ugd/df4650_2f26aba6a0a147d28728e58e7c2cc217.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_090a4e54dee44266831914e3442b3bd0.pdf
    • https://static.usrfiles.com/ugd/0cd3a8_5276fbe7ff674461bf7e74fbf6dfa09d.pdf
    • https://static.usrfiles.com/ugd/39cb9d_8e9e4fd331864929ba3e10948a77f785.pdf
    • https://static.usrfiles.com/ugd/b8c837_8758fbd13a154e019d46c88081db4d8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_33e1cc63d4504eafa87113d5abcd29bb.pdf
    • https://static.usrfiles.com/ugd/b8c837_269a0ae271c24819a837d7c986639da6.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_off000093d9.bin
34ff550f83f4cc751d53bdcb4cdce8028e401fda560f1f38dbf4f7bfe12ec3f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x93D9 5364 bytes
font_01_sfnt_off0000a60b.bin
75f2d6d4dfd650bff18171d09cf56ee871cad8501b3ea71a8528d358c94e5c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xA60B 10196 bytes