Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a1dfb176687c67…

MALICIOUS

PDF

52.7 KB Created: 2020-09-04 15:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60fc7518ca59ea5513196c081dd15f04 SHA-1: 4b7c76c29a28fbd55dd16868e122fff725a3907b SHA-256: e7a1dfb176687c67b16dda783114177af4c7a97a7f44c75bdb7728023bb10457
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with heuristics indicating it's a link farm for SEO purposes. One of these links, 'https://ttraff.link/wix?keyword=character+development+model+sheets', is flagged as a malicious redirector. The document body is heavily obfuscated but contains the same URL, suggesting the primary intent is to redirect users to malicious infrastructure. The file is generated by wkhtmltopdf, a tool often used to create PDFs from web content, which may have been abused to construct this link farm.

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.link/wix?keyword=character+development+model+sheets
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21096031872.pdf
    • https://cdn.shopify.com/s/files/1/0465/4366/7350/files/27933584410.pdf
    • https://cdn.shopify.com/s/files/1/0435/2681/5895/files/sutemexawedudidaluxex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9586/8057/files/common_questions_and_answers_in_job_interview.pdf
    • https://cdn.shopify.com/s/files/1/0429/5327/7589/files/tamivefaja.pdf
    • https://cdn.shopify.com/s/files/1/0434/1651/8805/files/chopin_piano_concerto_no_2_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/0183/8757/files/35627132519.pdf
    • https://cdn.shopify.com/s/files/1/0449/0140/0731/files/72577528907.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9464/files/19078334249.pdf
    • https://cdn.shopify.com/s/files/1/0465/3193/6414/files/jogokotavebopipelakomobi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8347/2791/files/nepali_song_mp3_galbandi.pdf
    • https://cdn.shopify.com/s/files/1/0440/7502/4549/files/50894052946.pdf
    • https://cdn.shopify.com/s/files/1/0436/4809/0270/files/kigesolive.pdf
    • https://cdn.shopify.com/s/files/1/0437/3017/4113/files/collapse_of_the_malolos_republic.pdf
    • https://cdn.shopify.com/s/files/1/0430/5911/8229/files/40614781731.pdf
    • https://cdn.shopify.com/s/files/1/0437/9967/5040/files/37247276641.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4580/files/esl_greetings_worksheets_for_adults.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_off00008fe1.bin
81b91261fcc3efb7802c3d0aadb644a47f2481e8540e1798c19c42f4e32c6014
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE1 5276 bytes
font_01_sfnt_off0000a1a7.bin
1795d1c6ac06a966a9906f8abf3d4888e75c5409b78bfe894cf563851437a598
pdf-font-stream PDF embedded font (sfnt) at offset 0xA1A7 10452 bytes