Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf58facc8fc03fd…

MALICIOUS

PDF

70.3 KB Created: 2020-08-20 07:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31ca8d86ffcd375cb3c87b37cdcea773 SHA-1: 24fa43bfeb143fd87891a154969e1be615a99878 SHA-256: caf58facc8fc03fd9b83aa48b66cf08ba60fb948bd37bd865b9a04a8fc10cc51
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link that is disguised with a seemingly benign keyword. The ML classifier strongly indicates maliciousness, and the PDF structure includes a large number of external links, suggesting a link farm for SEO manipulation or to host further malicious content. The primary malicious URL identified is https://ttraff.cc/pify?keyword=krishna+bhajan+songs+in+tamil+free.

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.cc/pify?keyword=krishna+bhajan+songs+in+tamil+free
    • http://files.sunsetsailkeywest.co/uploads/1/3/0/7/130739268/bunel-narisawetakelu-punolojuji.pdf
    • http://files.munonnetravel.dk/uploads/1/3/1/0/131069819/nukojagi-bilexabed.pdf
    • http://files.healthysettings.org/uploads/1/3/2/6/132681409/583a374b9c21.pdf
    • http://fonot.civilwarlady.org/uploads/1/3/1/4/131453329/sarudujavo_peref_sufupexapesar_kefeborikibew.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3637/files/zunokoxigebovoxusejoja.pdf
    • https://cdn.shopify.com/s/files/1/0459/7140/7015/files/83514430061.pdf
    • https://cdn.shopify.com/s/files/1/0427/3831/9527/files/sade_pblica_e_meio_ambiente.pdf
    • https://cdn.shopify.com/s/files/1/0428/1306/3327/files/27176917202.pdf
    • https://cdn.shopify.com/s/files/1/0430/8795/4073/files/duriwajozolopemu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5637/2631/files/ronapifofovamipapafepej.pdf
    • https://cdn.shopify.com/s/files/1/0432/0657/4238/files/46880385275.pdf
    • https://cdn.shopify.com/s/files/1/0427/5961/8716/files/past_simple_past_continuous_exercises_perfect_english_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/55490440552.pdf
    • https://cdn.shopify.com/s/files/1/0434/2461/2508/files/google_chrome_cnet_32_bit.pdf
    • https://cdn.shopify.com/s/files/1/0437/3980/7893/files/14054591413.pdf
    • https://cdn.shopify.com/s/files/1/0429/7719/8229/files/structural_analysis_9th_edition_solutions_manual.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_off0000ca7a.bin
e590f12d7637689b33d7c1f873c85693b2647e2400a6873b676722023f396bbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7A 5368 bytes
font_01_sfnt_off0000dc9b.bin
27f8b1dbb02abd0c5f7a647084f9798fed58ff40d9e4287f113a6abeec6076f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9B 14596 bytes

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