Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0d44072e246dd9…

MALICIOUS

PDF

50.1 KB Created: 2020-08-29 10:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e853206feec7f1a18fa31cab1fdba22c SHA-1: 715f4692934a19425fca25560524cd101c129da3 SHA-256: 9b0d44072e246dd937e118e0639560a3cc333a5a15ffd048e364ad9253b1bdd4
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one critical heuristic identifying a malicious redirector at ttraff.com. The document body, though partially corrupted, suggests a lure related to 'workbook answers pdf'. The presence of many external PDF links, some pointing to Shopify, indicates a link farm strategy. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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=close+up+b1+workbook+answers+pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0422/files/gufotodowojedofokifepix.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/13123891526.pdf
    • https://cdn.shopify.com/s/files/1/0433/9495/7466/files/fejilo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/fiseva.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e3a30113151436e925358d05a45388e.pdf
    • https://static.usrfiles.com/ugd/b8c837_754c1c18b95647f98a32f85d41fee370.pdf
    • https://static.usrfiles.com/ugd/b8c837_c18c34ad10884e728dd5f90b0d3ff43b.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b6596033ebe41459a3f3a90c3985e06.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f3915d817d241cca5973bb225ab508d.pdf
    • https://static.usrfiles.com/ugd/b8c837_33b79dd74dbf4dfe84b9bd8b29a53259.pdf
    • https://static.usrfiles.com/ugd/b8c837_1074e07e95a047e0bbf8a828a259661f.pdf
    • https://static.usrfiles.com/ugd/b8c837_9100776099b04fd1ada3874c247ff6d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b2d0ce8ec3146d986c39318d48955d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d86661d72384d4a871cc108e663307e.pdf
    • https://static.usrfiles.com/ugd/b8c837_607cf5f478734dbaa885c6cc1aadfda5.pdf
    • https://static.usrfiles.com/ugd/b8c837_139a9c5d3b4441b29ca999ea5cdc596e.pdf
    • https://static.usrfiles.com/ugd/b8c837_bbf91c6108f14eae92785eb872c8284d.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f994760ee454f9daf7516dd194d8805.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_off00007cef.bin
40edf0119cbf0cc390dd543f4c8f80612276d2eb527d4255f6bcc0453ec8bd45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CEF 5288 bytes
font_01_sfnt_off00008f0a.bin
f8b887399b1d90a0dd77612eb86ef1610d04e082c1bdfaacea35114576269cf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F0A 13876 bytes

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