Malicious PDF — malware analysis report

Static analysis result for SHA-256 6730a2e4ad4849fd…

MALICIOUS

PDF

41.0 KB Created: 2020-08-08 05:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cd4c648d9113aa029edfc7ada24cae2 SHA-1: 6818939c7cca9827af22a81132e46337989f184f SHA-256: 6730a2e4ad4849fddacd4b1638ac09c72578c3de98cf0be2aa76866b3e1e5f84
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which is a common tactic for distributing malware or leading users to phishing sites. The document body, though heavily obfuscated, contains text related to 'academic writing book pdf free download' and a malicious URL, suggesting a lure to a malicious download or phishing page. The ML classifier also 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/pify?keyword=academic+writing+book+pdf+free+download
    • http://files.mairiwilson.com/uploads/1/3/1/8/131856071/bapenoladijudaj_pevit_gadogeza.pdf
    • http://files.corvisierolaw.com/uploads/1/3/1/3/131383743/590d2457.pdf
    • http://files.twerkoutbylynnea.com/uploads/1/3/0/7/130775393/bemin_fewasakakelub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8740/4968/files/the_gaming_lemon_gta_5.pdf
    • https://cdn.shopify.com/s/files/1/0428/9419/6902/files/18827549346.pdf
    • https://cdn.shopify.com/s/files/1/0431/5371/9452/files/82285779827.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/63276704677.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9381/files/dikanubado.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/5283212991.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mojarugalemidim.pdf
    • https://cdn.shopify.com/s/files/1/0441/1087/2728/files/python_alphabetize_list.pdf
    • https://cdn.shopify.com/s/files/1/0434/8785/4749/files/push_files_to_github.pdf
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/gedupogusasugutubevofemix.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5271/files/blacksmithing_levelling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5388/files/82984335194.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_off000060be.bin
0b8c7d5dd96d935a944d9a411b8211683bf59f789784bd0417e7c157f76850c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x60BE 5584 bytes
font_01_sfnt_off000073ba.bin
8bbe25c3357b77f8d95a8681dd6b5304deccfee72975240d1ae6977c87c51136
pdf-font-stream PDF embedded font (sfnt) at offset 0x73BA 10360 bytes