Malicious PDF — malware analysis report

Static analysis result for SHA-256 8829c44bb8895c31…

MALICIOUS

PDF

46.7 KB Created: 2020-07-09 01:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4e2d52d55f334b782e4a5ec16b88c08 SHA-1: 2c5a14fed2a2121f04b6319327d62508541408d6 SHA-256: 8829c44bb8895c31c9ebe254b53dda444d708f6199e36f1bc71dbfa41406d26a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, constituting a link farm designed to direct users to malicious sites. The primary malicious redirector link is https://ttraff.ru/wb?keyword=segundo%20condicional%20ingles%20ejercicios%20pdf. The document body text, while partially corrupted, suggests a lure related to English grammar exercises, which is a common tactic for phishing or malware delivery. The ML classifier strongly indicated maliciousness.

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/wb?keyword=segundo%20condicional%20ingles%20ejercicios%20pdf
    • http://files.demirandaguitar.com/uploads/1/3/1/8/131871690/fokodibavuf_zogovisum.pdf
    • http://files.raananahikers.com/uploads/1/3/0/7/130775025/fixem_gifasuv_lodarojexe_bofagikapinasex.pdf
    • http://files.westmontmusicacademy.com/uploads/1/3/2/6/132683484/2c9b5e.pdf
    • http://files.lisaramseyphotography.com/uploads/1/3/0/7/130739658/7732559.pdf
    • http://files.bronnerlab.com/uploads/1/3/1/8/131857818/edba9b339e2.pdf
    • http://files.sacredmusicfestival.org.uk/uploads/1/3/0/9/130969298/relizameveva.pdf
    • http://files.mpindt.com/uploads/1/3/2/6/132683147/1616115.pdf
    • http://files.ubtsshreveport.org/uploads/1/3/1/3/131383305/jopipetibi_rikixup_fimiparakux.pdf
    • https://xaluwab.files.wordpress.com/2020/06/kileleritiduvezadok.pdf
    • https://xevadev.files.wordpress.com/2020/06/66075979261.pdf
    • https://dinipexus.files.wordpress.com/2020/06/34988534413.pdf
    • https://vipapemekus.files.wordpress.com/2020/07/81049850611.pdf
    • https://ribodijexob.files.wordpress.com/2020/07/judusowaga.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12729031526.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowelikuzamutaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72593533024.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pelezegagujagemubejapo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wefudebavisizaku.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mofofuledezenededur.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kilezibuvi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060a7.bin
ccd862f0677c5bba575b4b80afdd75fae56af9d37213f4bbab5e884e649706d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60A7 5304 bytes
font_01_sfnt_off000072b5.bin
7ac4c0c3411f82d4f0419d0ccf4dfc08e054aa9fec0fc49972c8644a3a784662		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72B5 11264 bytes
font_02_sfnt_off00009776.bin
0674acd334b5d9d24fca46324cf24cdceda2da50095ae44f67deaeca14b27464		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9776 16240 bytes

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