Malicious PDF — malware analysis report

Static analysis result for SHA-256 119909398aa48750…

MALICIOUS

PDF

55.1 KB Created: 2020-08-14 04:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 908e0bab545c4685e017f2541f9b0969 SHA-1: f5473dd356ad633d44def4de0fe0ca1043aa91b5 SHA-256: 119909398aa487506a842b0b24d02bd358d5226ad9b99b14bf0758506757d38e
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for machine learning content, suggesting a phishing or scam attempt. The presence of multiple external PDF links also indicates a link farm, a common tactic for SEO manipulation or distributing malicious 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.ru/pify?keyword=machine+learning+pdf+by+andrew+ng
    • http://files.summerfry.com/uploads/1/3/0/7/130738836/lumaluxuninu_zuten_kuvipinukakef_rosobi.pdf
    • http://files.tasc-group.com/uploads/1/3/0/9/130969418/1500612.pdf
    • http://files.pennjournalconlaw.com/uploads/1/3/1/8/131871424/xizotubulaxumub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/4315/8166/files/xuzerevatinilezoweja.pdf
    • https://cdn.shopify.com/s/files/1/0439/4647/5678/files/javascript_reload_page.pdf
    • https://cdn.shopify.com/s/files/1/0450/4561/2694/files/90603156608.pdf
    • https://cdn.shopify.com/s/files/1/0436/1355/2802/files/watibotuwamilofep.pdf
    • https://cdn.shopify.com/s/files/1/0431/7331/4715/files/dawuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/0879/4530/files/19487504779.pdf
    • https://cdn.shopify.com/s/files/1/0451/8638/4023/files/99018954891.pdf
    • https://cdn.shopify.com/s/files/1/0431/1177/6416/files/markup_ipad_apple_pencil.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6436/files/wenofovasezanesokogi.pdf
    • https://cdn.shopify.com/s/files/1/0436/3947/2288/files/bhu_bsc_nursing_entrance_exam_syllabus.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008920.bin
a385329756354b6d87e0d034aafa60e3018804f8844c06108e9285a62e586fd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8920 3728 bytes
font_01_sfnt_off00009651.bin
1303771a4108c69f866cc7407ee4fd6d0e93796452a0cbf49185edfefb0bd7ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9651 5580 bytes
font_02_sfnt_off0000a955.bin
90a80006472d202cd27d865dc0491cf17ab0d0087ada0d1c47d5853f9227ee8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA955 11000 bytes

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