Malicious PDF — malware analysis report

Static analysis result for SHA-256 199dc27b440b12ab…

MALICIOUS

PDF

53.0 KB Created: 2020-08-11 09:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 544f16de3ae8aede1963a5b033f74757 SHA-1: cc15425eae5c7c485260adca6bcc939c0b8cd34f SHA-256: 199dc27b440b12abded6fc47a74695f2c52ad3d960745366692147751dbdad68
154 Risk Score

Malware Insights

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

The PDF contains a link farm with 30 external PDF links, many of which are hosted on Shopify. One of the primary links, disguised as a search result for 'Animal farm book pdf chapter 2', leads to a known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to trick users into downloading further content.

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/wb?keyword=animal%20farm%20book%20pdf%20chapter%202
    • http://files.unitedcollections.net/uploads/1/3/1/4/131437779/eb93ca.pdf
    • http://files.perrykomdat.com/uploads/1/3/1/3/131383838/1212870.pdf
    • http://files.hudsonagency.net/uploads/1/3/0/9/130969656/jadadadekipujiveg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3638/4149/files/xowolu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6640/0673/files/fupiluw.pdf
    • https://cdn.shopify.com/s/files/1/0438/5128/4642/files/free_3rd_grade_math_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0430/8497/2183/files/53020742364.pdf
    • https://cdn.shopify.com/s/files/1/0443/9402/1030/files/archie_comics_english.pdf
    • https://cdn.shopify.com/s/files/1/0435/4303/6053/files/39975048104.pdf
    • https://cdn.shopify.com/s/files/1/0440/5261/1222/files/widipuse.pdf
    • https://cdn.shopify.com/s/files/1/0428/0611/6511/files/xubavizazupebejero.pdf
    • https://cdn.shopify.com/s/files/1/0434/9011/5748/files/ftb_server_commands.pdf
    • https://cdn.shopify.com/s/files/1/0428/1643/8438/files/energy_environment_and_climate_wolfson_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/4833/6536/files/temporal_lobe_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0435/3956/2651/files/lilagal.pdf
    • https://cdn.shopify.com/s/files/1/0430/3863/8241/files/tanorixax.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_off000092d6.bin
f6d7986c8b9224ef1454fa6e2bf8089989c9391bbb6004553110a173607c02fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92D6 5544 bytes
font_01_sfnt_off0000a575.bin
7602c45f7cb4a78f97f4fa783d8b475af599eb51da31fa90128fb0ecade7bf8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA575 9724 bytes

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