Malicious PDF — malware analysis report

Static analysis result for SHA-256 886aa109f8d9f990…

MALICIOUS

PDF

43.6 KB Created: 2020-08-29 01:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c59402b63b0efeb4dc3291bb6406f473 SHA-1: f301bcc35eb7ffe1510db3618551db522823d328 SHA-256: 886aa109f8d9f990462c17a458154800b9befa1359c34ba4f38a8bda59115699
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The presence of a link farm suggests an attempt to distribute malicious content or engage in SEO abuse, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=always+hungry+dr+david+ludwig
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0880/2466/files/kerala_psc_omr_answer_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/5078/5173/files/51348668985.pdf
    • https://cdn.shopify.com/s/files/1/0432/3649/1431/files/android_1_games_candy_crush_jelly_saga.pdf
    • https://cdn.shopify.com/s/files/1/0434/1648/6040/files/african_american_history_trivia_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/2727/4645/files/sqlalchemy_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0437/7106/8577/files/65267607057.pdf
    • https://cdn.shopify.com/s/files/1/0433/4374/1083/files/73522420548.pdf
    • https://cdn.shopify.com/s/files/1/0432/9344/2208/files/sebebibudof.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8151/files/fofinudokidazerozo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5523/4710/files/wukonapokaximizifi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3095/4655/files/28627013934.pdf
    • https://cdn.shopify.com/s/files/1/0430/3015/1330/files/muzagekolidoni.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9510/files/23660896718.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a97.bin
56b298c20236522c6ee19b2cc161b9020e54889484029b23bd4bc346eb0d6005
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A97 5332 bytes
font_01_sfnt_off00007cbf.bin
bc3de1499574bf6ffeda651ba9706e3ff75f725e34b36aca6b73467c32a42796
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CBF 10808 bytes