Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcff3607c2f1cfcf…

MALICIOUS

PDF

41.1 KB Created: 2020-09-12 17:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff75e1668d7acfd651ef2ae69afa1336 SHA-1: 4227cb2420f196f75d11f488efc22eae847b2da8 SHA-256: dcff3607c2f1cfcf61c0c5d4bf9206bd21865ad89a0682a6cbba8ad5f41253c3
120 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, disguised as a resource for interview questions. The PDF also contains a large number of links to external PDFs hosted on Shopify, likely for SEO manipulation or to obscure the malicious redirector. No scripts were extracted, and the document body is heavily obfuscated.

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.com/wix?keyword=example+answers+to+competency+interview+questions
    • http://files.robin-mccarthy.com/uploads/1/3/1/0/131070861/869005.pdf
    • http://lijole.northtexasprodetailing.com/uploads/1/3/1/3/131383314/1230663.pdf
    • http://rifevufid.goodvinesonly.com/uploads/1/3/1/8/131857631/cb0939def3.pdf
    • http://livekab.aghortteachers.org/uploads/1/3/2/6/132695240/e8078e73.pdf
    • http://files.valleyfieldfarmltd.com/uploads/1/3/0/9/130969904/jilujus.pdf
    • https://cdn.shopify.com/s/files/1/0438/1632/1184/files/97594847311.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5130/files/15610094502.pdf
    • https://cdn.shopify.com/s/files/1/0428/7728/8611/files/binary_search_in_c_program.pdf
    • https://cdn.shopify.com/s/files/1/0428/8924/8924/files/bye_bye_man_imdb_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/9358/0189/files/rujod.pdf
    • https://cdn.shopify.com/s/files/1/0435/3461/4688/files/44923743755.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5018/files/84714508816.pdf
    • https://static.usrfiles.com/ugd/4c3d6a_0fefa4779462431c92d6226102713076.pdf
    • https://static.usrfiles.com/ugd/ebbcbd_37279f99cc724b9591526f84789e79ac.pdf
    • https://static.usrfiles.com/ugd/838e7e_2a2191dc5ad245719196bacb9fbd7a77.pdf
    • https://static.usrfiles.com/ugd/2c76f4_e3e23485588242a5904e4846dbd3c55e.pdf
    • https://static.usrfiles.com/ugd/ce5d00_9685ca5af7e948b29b59d0f654431a4b.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_off0000623b.bin
4e98aef88005fd43a7f7d4897596378d8311795d822249776bbc9b159889ed3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x623B 5484 bytes
font_01_sfnt_off000074f0.bin
50a6d9282be011133575682f632923d8b9fa0fbdfee5ef471ec0994167ef2f28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74F0 9996 bytes

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