Malicious PDF — malware analysis report

Static analysis result for SHA-256 341714b16edc6257…

MALICIOUS

PDF

36.7 KB Created: 2020-08-12 15:40:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e7690c85e299b25f30ae2fc16d13be1 SHA-1: 02517dc9160a2f2e0d74642b140a30c0173f9075 SHA-256: 341714b16edc6257c58295f9aa02dfe5577d5799e403299c3ebdeb9326a5603e
154 Risk Score

Malware Insights

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

The PDF document contains a link farm designed to appear as free PDF downloads, but one of the primary links redirects to known malicious infrastructure. The ML classifier strongly indicated maliciousness, and the document body, though obfuscated, contains the lure text and the malicious URL. The presence of numerous links to Shopify-hosted PDFs suggests an attempt to manipulate search engine results 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=ansi+c+programming+book+pdf+free+download
    • http://files.jeelsphoto.com/uploads/1/3/1/8/131871744/6ae1ba3080194.pdf
    • http://files.sunshinecoastcounselling.com/uploads/1/3/1/4/131407423/6456871.pdf
    • http://mirured.boothillherbs.com/uploads/1/3/0/9/130969744/jazez_gimetaporekamo.pdf
    • http://files.jordanmooredesigns.com/uploads/1/3/2/7/132740665/5121100.pdf
    • http://files.carolynangleton.com/uploads/1/3/2/8/132814136/faxixuvajig_fexobegumokinet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9227/1519/files/bilar.pdf
    • https://cdn.shopify.com/s/files/1/0454/6953/2310/files/8374645661.pdf
    • https://cdn.shopify.com/s/files/1/0431/5034/4352/files/20272147859.pdf
    • https://cdn.shopify.com/s/files/1/0435/9212/2536/files/kidinopevikafupulag.pdf
    • https://cdn.shopify.com/s/files/1/0437/6127/0935/files/human_digestive_system_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/the_courage_to_be_disliked_reddit.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/careless_whisper_sax_notes.pdf
    • https://cdn.shopify.com/s/files/1/0434/9925/8022/files/wifexijejeruzonubedeb.pdf
    • https://cdn.shopify.com/s/files/1/0436/1145/5645/files/ritaze.pdf
    • https://cdn.shopify.com/s/files/1/0429/1208/8231/files/kindle_to_epub_converter.pdf
    • https://cdn.shopify.com/s/files/1/0450/3745/3470/files/5864186267.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/cultural_anthropology_asking_questions_about_humanity_free.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_off00005038.bin
358376f560ffe091094536366a5d67b5ee11a0bc74cf82dda4ce445b599dd4c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5038 5760 bytes
font_01_sfnt_off000063bc.bin
ce01a21af22591c542527de80150fc3face432626edf9058bd751efb13fb8906		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63BC 9920 bytes

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