Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aae7ba2a2ddf81d…

MALICIOUS

PDF

41.8 KB Created: 2020-08-30 03:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5761a2f04bd79493c66c0a449c5feb19 SHA-1: d4f8964a88a921947a62d1d554a3cc7e3f706476 SHA-256: 1aae7ba2a2ddf81d3439c00cb838becb47fb4e97e080c37dae027d1f85cb70c6
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The file also exhibits characteristics of a link farm, with numerous embedded links to external PDF documents, likely to improve search engine ranking for malicious purposes. The primary malicious IOC is the redirector URL.

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=multiple+regression+spss+write+up
    • https://cdn.shopify.com/s/files/1/0437/9141/7505/files/benim_hocam_video_ders_notlar_trke.pdf
    • https://cdn.shopify.com/s/files/1/0434/0740/9308/files/esic_stenographer_syllabus_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0450/3745/3470/files/subject_verb_agreement_worksheets_grade_3.pdf
    • https://cdn.shopify.com/s/files/1/0433/6356/5727/files/laluwezana.pdf
    • https://static.usrfiles.com/ugd/de60da_7f1f63bf150147759fdb5c3dd60f2cf7.pdf
    • https://static.usrfiles.com/ugd/a1fb72_143a216fa6ec404186ca33f277bac9b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0bad03dd9e14df385d2d34b03e16fb8.pdf
    • https://static.usrfiles.com/ugd/b8c837_758c2b7f06cc41bfa13a33e69335c60d.pdf
    • https://static.usrfiles.com/ugd/43d598_51324a4b2d044994a0e4bc311dd9e617.pdf
    • https://static.usrfiles.com/ugd/e2b09b_014642126e97493ebe39088bca3971bb.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_off000066c4.bin
da1ee9be3f335be6a7b79492b2dc834e8d9ae46c1c77b08f8b9a1693ade0981a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66C4 4876 bytes
font_01_sfnt_off00007789.bin
4f0ffa4b83304f5f9778bc903ced13243acffdcdf94058cdb10796ad3a3c34ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7789 9960 bytes

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