Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1d810aa63765ef…

MALICIOUS

PDF

57.0 KB Created: 2020-08-30 16:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d735fb299f4ea84be91f67e516d8a88 SHA-1: 383620cdf62a6abca78cde323a787aff07300602 SHA-256: 3f1d810aa63765ef1f8a2f3f3617fa7ccaaab32fea70eeb5679fc72f723ab12a
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to other PDF files hosted on static.usrfiles.com, forming a link farm. One of the embedded links points to a known malicious redirector at ttraff.ru. This suggests the document is part of a campaign to manipulate search results or distribute malicious content through a network of linked PDFs.

Heuristics 3

  • 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.
  • 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=legend+of+zelda+logos
    • https://static.usrfiles.com/ugd/54fa57_37bdf42f49994c99b9bf0c5f3b2bcacc.pdf
    • https://static.usrfiles.com/ugd/3eed2b_96cb79294e0d4429a8a732215e92be21.pdf
    • https://static.usrfiles.com/ugd/b11f6d_b9a74eb87d474cde9f60de2f7529656f.pdf
    • https://static.usrfiles.com/ugd/19ce5d_38a336b08e1d4ebf99b4d01710e5d247.pdf
    • https://static.usrfiles.com/ugd/b8c837_8975f5a5e0a24ff2977e82b9764059af.pdf
    • https://static.usrfiles.com/ugd/81d6a4_e38dd220c2a641f9b1beeefd4c044408.pdf
    • https://static.usrfiles.com/ugd/0c8cc8_6637e1fd8b6e4889bed54473f0af92d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_b22f59b59907468798f4fda32dbf3f5f.pdf
    • https://static.usrfiles.com/ugd/4b874d_9e5af9617e184b33808e399cd31ee673.pdf
    • https://static.usrfiles.com/ugd/b11f6d_8534873d41234a3882d1d3b2fb8846a7.pdf
    • https://cdn.shopify.com/s/files/1/0430/3329/7058/files/zelexifefusedapofow.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/jepelun.pdf
    • https://cdn.shopify.com/s/files/1/0465/0709/8262/files/zegemefenafolatuwafe.pdf
    • https://cdn.shopify.com/s/files/1/0437/5828/9045/files/37205955208.pdf
    • https://cdn.shopify.com/s/files/1/0432/8849/4236/files/ucsd_ship_waiver.pdf
    • https://static.usrfiles.com/ugd/4f270c_cb07f059bda040b0a1be9225cc9e0f6f.pdf
    • https://static.usrfiles.com/ugd/aef5b7_ec61705f5c204b01b30cb5436bb743a6.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000b2cd.bin
7e1d118afd782614d83805300b568913dc82e1cb7a6fa757fdda44b9345dc82c
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB2CD 21192 bytes
font_00_sfnt_off00006d46.bin
7dc4f3d928c727f897cfc6e42d2ce146fdeed2f9bde7adda72e4a034798cc690
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D46 4548 bytes
font_01_sfnt_off00007d24.bin
6d784573a6eaf8d84eda42c0cbed65f784d461888b49c24fd3817f5bffe555cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D24 4968 bytes
font_02_sfnt_off00008e37.bin
f7307d7275d183e1231f6915da7a2ebdbfd8754b0eb8c2fe81fb523189aa4727
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E37 10588 bytes