Malicious PDF — malware analysis report

Static analysis result for SHA-256 261d8113a1837aac…

MALICIOUS

PDF

40.8 KB Created: 2020-08-20 03:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e79a604b0ba704d0f39aff9b8d8aeaaf SHA-1: 9ddfdd357368955d539b571a9bef0e27e8ff750a SHA-256: 261d8113a1837aac5f596b864a1d95447045cbbfc43faccb81cf4593fa68dce3
130 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.ru. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for teachers seeking a self-appraisal form. The PDF also contains a link farm heuristic, indicating a large number of external links, many of which are hosted on Shopify. The primary malicious IOC is the ttraff.ru redirector.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=self+appraisal+form+sample+filled+for+teachers
    • http://bimoxako.alexmunroewrites.com/uploads/1/3/1/0/131071047/3698343.pdf
    • http://files.thesarcasticsarcoma.com/uploads/1/3/0/8/130813796/0461b82209024b.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/10809735118.pdf
    • https://cdn.shopify.com/s/files/1/0441/4429/6088/files/antrenmanlarla_matematik_yeni_nesil_tyt.pdf
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/semifizusejekob.pdf
    • https://cdn.shopify.com/s/files/1/0435/4539/5359/files/sipojamefux.pdf
    • https://cdn.shopify.com/s/files/1/0437/1139/8041/files/72543470843.pdf
    • https://cdn.shopify.com/s/files/1/0440/7777/7061/files/sql_database_administrator_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/8212/9320/files/xirowimibebepasifozego.pdf
    • https://cdn.shopify.com/s/files/1/0433/0917/0856/files/2873007212.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7913/files/95848939804.pdf
    • https://cdn.shopify.com/s/files/1/0431/3785/9735/files/34997567973.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_off0000616a.bin
233bffd39cec795baf35b2f36f9d41d7c6472b75bcb29c442de2fba9d439d8a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x616A 5500 bytes
font_01_sfnt_off000073f2.bin
245a78fe6e9cd651b6b684ed76b030e8fc9ae9a8a4cb5084d5fd7674c5537bdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73F2 10116 bytes

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