Malicious PDF — malware analysis report

Static analysis result for SHA-256 175dd3a42f3a1d7b…

MALICIOUS

PDF

40.4 KB Created: 2020-08-22 22:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdf8f9a3336b4dbeb005967c6d1333fb SHA-1: 5c8574a380b113cf1412adfb1c47a050a74cfc28 SHA-256: 175dd3a42f3a1d7b3028d638f8ec5a5381348513d37c0457fe70eba79c272496
154 Risk Score

Malware Insights

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

The PDF document contains embedded URLs, with one identified as a malicious redirector. The document body, though partially corrupted, includes text suggesting it's a study guide, likely a lure to entice users to click the malicious link. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm used to obscure the malicious destination. No scripts were extracted, but the PDF structure and embedded links point towards a phishing or redirection attack.

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=jcahpo+coa+study+guide
    • http://xizebutev.designerconsignors.com/uploads/1/3/0/7/130738524/mawobubuz_levije_kiwosikisubofok_galefiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0460/6518/9019/files/ruvonabirole.pdf
    • https://cdn.shopify.com/s/files/1/0432/8062/9913/files/introduction_to_hydrology_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/4464/1695/files/download_vimeo_videos.pdf
    • https://cdn.shopify.com/s/files/1/0434/5177/7185/files/likepewalalutipajuwufiwe.pdf
    • https://cdn.shopify.com/s/files/1/0434/8585/5897/files/3147449146.pdf
    • https://cdn.shopify.com/s/files/1/0431/1485/6610/files/dementia_prevention_intervention_and_care.pdf
    • https://cdn.shopify.com/s/files/1/0432/3727/7855/files/furupowa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20931566490.pdf
    • https://cdn.shopify.com/s/files/1/0432/2682/4863/files/74428131028.pdf
    • https://cdn.shopify.com/s/files/1/0435/4503/4911/files/50781540955.pdf
    • https://cdn.shopify.com/s/files/1/0436/5287/4390/files/13066659603.pdf
    • https://cdn.shopify.com/s/files/1/0430/0098/7811/files/wepup.pdf
    • https://cdn.shopify.com/s/files/1/0431/3546/7669/files/sibiwefisunubiwepegeweja.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5573/files/luruwanekelepijowedo.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_off00005dba.bin
5c1e9a4c718c9de07d854b8e6f737b626e099a2551a459c91fdc51c2e16acfcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DBA 5300 bytes
font_01_sfnt_off00006fbf.bin
163a7fe80db02e0be9928f3b9484a3c3ab494f0fc27174d0aa8854c49a7e6f5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FBF 10960 bytes

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