Malicious PDF — malware analysis report

Static analysis result for SHA-256 a906c7704187774c…

MALICIOUS

PDF

38.6 KB Created: 2020-08-31 20:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3e3196c8fef0c8f6c70e36e9ed1efe5 SHA-1: e6cf0f9371584555a67052942e4c96cd759721a9 SHA-256: a906c7704187774ccca70982755460eb835ba533d01f1848d9127329742bbb43
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body and embedded links suggest a tactic to lure users to external, potentially malicious, content farms or redirectors.

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=beautiful+life+zumba
    • https://static.usrfiles.com/ugd/8b97dd_80844ffa696541e8b203683f949f2eaf.pdf
    • https://static.usrfiles.com/ugd/87b9a8_4d5739fb043545069ee27b821f3c3d6e.pdf
    • https://static.usrfiles.com/ugd/963627_140fcf10b5484065b9a6c45bbd76ec0b.pdf
    • https://static.usrfiles.com/ugd/8dde66_b50b32fae6404f1f9e8381913cebbcbb.pdf
    • https://static.usrfiles.com/ugd/33a16d_4055dc85709d4c55b2cd57604f4c09c0.pdf
    • https://cdn.shopify.com/s/files/1/0434/1835/3821/files/gozuzanarirumeriru.pdf
    • https://cdn.shopify.com/s/files/1/0463/6891/5617/files/28116032412.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/pibevulus.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a12b8c2a6b14c78b162a8183953af0f.pdf
    • https://static.usrfiles.com/ugd/2ca09c_5b94b406ee424c348d99818a548bd2fc.pdf
    • https://static.usrfiles.com/ugd/585b1d_6ab38b50cd364dc68abe8901549f8e4b.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_off000047e8.bin
dd21293a96ab07fdd368beb947ddec9de10a007e6cd48ca6efc29a8953963efe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47E8 4544 bytes
font_01_sfnt_off00005769.bin
129c62de3e0ac73f29c58f0ec2e3e4da80dffeec7dd227837dd91be90e6f02c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5769 12132 bytes
font_02_sfnt_off00007e8a.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E8A 4324 bytes

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