Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb4f6c3647f1948…

MALICIOUS

PDF

35.5 KB Created: 2020-09-02 18:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e37df3b38494385752ae67e29c678148 SHA-1: c3ba29943b34d17c20de8d8ae078f6765fd999ba SHA-256: acb4f6c3647f194889121d8f393d0804e9228edfdb0857e49a746a1be37d5a78
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, disguised as a factoring worksheet. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be social engineering through a deceptive document lure, directing users to a malicious URL.

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.ru/wix?keyword=factoring+quadratics+a+1+worksheet
    • https://static.usrfiles.com/ugd/90423f_d4b032510e66407790ee288c12c8ef00.pdf
    • https://static.usrfiles.com/ugd/b8c837_db5ce2301eab471998b6d72e6d83ad04.pdf
    • https://static.usrfiles.com/ugd/590778_daf0aac50ff6467a80c188e39e4b90bb.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93434530871.pdf
    • https://cdn.shopify.com/s/files/1/0431/4578/9606/files/cardiovascular_physiology_klabunde.pdf
    • https://cdn.shopify.com/s/files/1/0437/6713/6413/files/all_about_space_download.pdf
    • https://cdn.shopify.com/s/files/1/0449/2325/6999/files/patologi_klinik_veteriner.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/libertarian_socialism.pdf
    • https://static.usrfiles.com/ugd/8de238_0b20ca6572a94647920281d170e5e12c.pdf
    • https://static.usrfiles.com/ugd/1be480_ed08874ab78b4baaa4a54bdf4c12f032.pdf
    • https://static.usrfiles.com/ugd/b8c837_68a0f57776cd4fff9c020f98b8c7fc41.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_off00004d0b.bin
b8a43a7e1470d5c925febb0046858d6d896923d903d23e2f4c80f640b5ceb8f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D0B 5456 bytes
font_01_sfnt_off00005fa2.bin
75de42048809a6b80d71a001317f0e1824e75e213716c6bb4a2607195c593c49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA2 9904 bytes

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