Malicious PDF — malware analysis report

Static analysis result for SHA-256 117a8c0daa61bdeb…

MALICIOUS

PDF

40.8 KB Created: 2020-08-22 13:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d128916bc869151770dbaa40a517a025 SHA-1: 14246197949cfd3e59e57a54327175d4fdb798d7 SHA-256: 117a8c0daa61bdeb2e70a3c2a99a0edad1ba517ca082699e8a61072aab1a6da2
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though partially corrupted, includes text related to job postings and a URL that appears to be part of a link farm. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests an attempt to drive traffic to malicious sites or engage in SEO manipulation.

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.cc/pify?keyword=formation+adjoint+administratif+greta
    • http://files.onekerato.com/uploads/1/3/0/7/130776433/41ab9.pdf
    • http://files.shortcrazyvietnam.com/uploads/1/3/1/6/131607131/fomowiver.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/benzophenone_msds.pdf
    • https://cdn.shopify.com/s/files/1/0433/6196/0091/files/rudram_lyrics_in_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0432/4166/8770/files/kijonisategesezoza.pdf
    • https://cdn.shopify.com/s/files/1/0433/6274/6517/files/etiology_of_osteoarthritis.pdf
    • https://cdn.shopify.com/s/files/1/0434/0557/4309/files/katufipimaxu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1779/6764/files/13.pdf
    • https://cdn.shopify.com/s/files/1/0430/9689/9745/files/nasulusegumu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2062/2756/files/simple_half_life_problems_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/3087/9136/files/best_malayalam_movies_2018.pdf
    • https://cdn.shopify.com/s/files/1/0427/7485/5846/files/market_analysis_template_ppt.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/biology_class_12_ncert_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/0288/8351/files/vewisavop.pdf
    • https://cdn.shopify.com/s/files/1/0431/8760/1559/files/65474017307.pdf
    • https://cdn.shopify.com/s/files/1/0439/0112/4760/files/papelukewor.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_off0000622f.bin
a10b898006a94ae0d9a5ed1ac63661409861f6c66c7a92087ad730dcb466d3ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x622F 5228 bytes
font_01_sfnt_off000073e1.bin
8ff80aae1a751c99ef85cd803ffc0deca4441d14029fd924e2cac5ef5b9d8776		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73E1 10272 bytes

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