Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c81d89f4b5cc352…

MALICIOUS

PDF

55.0 KB Created: 2020-08-25 14:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da04f1b3df81fbf189336f839c34f58e SHA-1: 02fe9c538de2ddee8a85e1db67f881da0ba7884c SHA-256: 5c81d89f4b5cc35222a023326a19dda05a9739baa1a313e414d4650806ee7dc9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one identified as a malicious redirector pointing to 'https://ttraff.com/pify?keyword=assamese+hori+naam+audio+song'. The document also exhibits characteristics of a link farm, with numerous external PDF links, suggesting an attempt to drive traffic or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion of a malicious intent.

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.com/pify?keyword=assamese+hori+naam+audio+song
    • http://files.hillsidepreschoolnj.com/uploads/1/3/2/3/132303373/malakuwafifotufede.pdf
    • http://files.clearlightastrology.com/uploads/1/3/1/4/131436956/8830642.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/6148/6503/files/togoxig.pdf
    • https://cdn.shopify.com/s/files/1/0430/3467/3305/files/65012557850.pdf
    • https://cdn.shopify.com/s/files/1/0432/9809/5272/files/bomipepuleniluz.pdf
    • https://cdn.shopify.com/s/files/1/0431/7750/9020/files/paxideguxodebawerojirage.pdf
    • https://cdn.shopify.com/s/files/1/0440/1725/4565/files/aqa_a_level_computer_science_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7342/files/najanoxotukuzipavegajeso.pdf
    • https://cdn.shopify.com/s/files/1/0429/6415/6582/files/icao_annex_19_second_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/0904/7717/files/12022719430.pdf
    • https://cdn.shopify.com/s/files/1/0460/7236/5220/files/84610291720.pdf
    • https://cdn.shopify.com/s/files/1/0428/8774/1607/files/99423070672.pdf
    • https://cdn.shopify.com/s/files/1/0432/1932/0992/files/sansui_television_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/
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006948.bin
3a69789921b8c398e0231c7a5a78b2f6fa8c281b93c0738e2db00b76b3071c7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6948 5196 bytes
font_01_sfnt_off00007abd.bin
e44f493d4d106f7971e0fa30758bd7169c45ad48515956efada6a75e0221e1d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ABD 5012 bytes
font_02_sfnt_off00008b04.bin
5372f7115ca1272292864de99cb466c116b304402011deee73386f6fd15094b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B04 14636 bytes
font_03_sfnt_off0000b958.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB958 16204 bytes

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