Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dcc65ac8932c986…

MALICIOUS

PDF

42.6 KB Created: 2020-08-05 16:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6680dc41991e663fe0796755f94996bc SHA-1: 6e6b3898c092f230cdd03dd8b7643cce6d7bacd4 SHA-256: 0dcc65ac8932c9860e866f829f8b129f0d9d3a44a3030113d4bdf2b8aedb0417
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a significant number of embedded links, identified as a link farm, with at least one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves tricking users into clicking these links, which likely leads to further malicious content or downloads.

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/pify?keyword=bebidas+espirituosas+pdf
    • http://files.shadysideofthetracks.com/uploads/1/3/1/4/131406762/9744250.pdf
    • http://jamipuve.admissionsandaid.com/uploads/1/3/0/8/130874493/tusixesipi-befovaxumaz.pdf
    • http://files.cookingnutritionseattle.com/uploads/1/3/0/7/130739916/kexepuget.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/4194/5760/files/47191170972.pdf
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/xinukanuzebezet.pdf
    • https://cdn.shopify.com/s/files/1/0435/0191/2224/files/4282717350.pdf
    • https://cdn.shopify.com/s/files/1/0429/7709/9935/files/jagepum.pdf
    • https://cdn.shopify.com/s/files/1/0440/6634/1029/files/siforumusezoweka.pdf
    • https://cdn.shopify.com/s/files/1/0432/8813/3787/files/jebupisiduzagimefabunu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8217/8979/files/vufuzowonuvarexikaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/3723/7146/files/kepepujadelukoxuzozusilo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8883/0873/files/91465198654.pdf
    • https://cdn.shopify.com/s/files/1/0439/4100/3432/files/cambridge_english_for_engineering_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0430/7379/8306/files/61502806811.pdf
    • https://cdn.shopify.com/s/files/1/0437/6310/5953/files/5e_status_effects.pdf
    • https://cdn.shopify.com/s/files/1/0433/9456/4252/files/52067839101.pdf
    • https://cdn.shopify.com/s/files/1/0434/9198/3512/files/83242348317.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_off0000647e.bin
5d1927c449633fa4838b1bbbcbe9cd53eb3d61413e8331dda3dcf6537269f98e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x647E 5192 bytes
font_01_sfnt_off00007630.bin
3ab5c1040815804014b66f12ff0e07cfcf32db546f70adc7b6e9257f58ea93f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7630 11744 bytes

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