Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb955f185fb69258…

MALICIOUS

PDF

44.8 KB Created: 2020-08-07 18:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db0578b84aa86fe277e23ce415a77f72 SHA-1: 544514e77aec8a3e532a7a4d7d19c400b611ceae SHA-256: bb955f185fb692581197b13c2a70420efcc483121d298bdaae9f90102e6e480e
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the URL and appears to be a lure related to a PDF book. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it's designed for malicious redirection.

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=su+alteza+serenisima+libro+pdf
    • http://files.dollardsoccer.ca/uploads/1/3/0/7/130775413/2467931.pdf
    • http://vefevijak.summerhandballcamp.com/uploads/1/3/1/6/131637254/wutevugokapigavova.pdf
    • http://files.zikhafrimainecoon.com/uploads/1/3/1/3/131398347/tapejimiwatipub_molewutunowotun.pdf
    • https://cdn.shopify.com/s/files/1/0433/5783/1326/files/96116856712.pdf
    • https://cdn.shopify.com/s/files/1/0433/6707/1894/files/tubonemew.pdf
    • https://cdn.shopify.com/s/files/1/0432/8020/3944/files/camtasia_studio_8_manual_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0433/8227/6257/files/livestock_production_and_climate_change.pdf
    • https://cdn.shopify.com/s/files/1/0433/9433/4869/files/25781032299.pdf
    • https://cdn.shopify.com/s/files/1/0430/7822/1973/files/64797867013.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3270/files/muririnifosute.pdf
    • https://cdn.shopify.com/s/files/1/0432/4121/0024/files/suzuki_intruder_vs800_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/cch_chuyn_file_nh_sang_word.pdf
    • https://cdn.shopify.com/s/files/1/0440/8524/8165/files/north_american_free_trade_agreement_certificate_of_origin.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/lidaki.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/12326059168.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e64.bin
44d0ab3db08b9c1ecb9eb6147afbf2add653cdbe8e2f2e33312a64917627f384
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E64 5480 bytes
font_01_sfnt_off000080ea.bin
c30328d1232b738b3c77169f6a4ee681300a23c6734c51794cae24dfad2ca92d
pdf-font-stream PDF embedded font (sfnt) at offset 0x80EA 11280 bytes