Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e66e9d8e4f0da6a…

MALICIOUS

PDF

48.7 KB Created: 2020-08-19 01:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2d9b3147ca6619d8e79d4fad5db47c5 SHA-1: fb79b91ab0b653cb7316cc2ce76e8fc998e7f6c5 SHA-256: 7e66e9d8e4f0da6ad51e3b9e1aadae120575c9649dcd49e70e0c47d932a34295
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 link farm designed to improve SEO. One prominent URL, https://ttraff.com/pify?keyword=best+antivirus+for+pc+offline+installer, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to download potentially malicious software. The ML classifier strongly supports the malicious nature of this PDF.

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.com/pify?keyword=best+antivirus+for+pc+offline+installer
    • http://gesafoj.miniaturebullterriers.info/uploads/1/3/1/6/131606289/51c13d0a0b4788.pdf
    • http://files.rosesintheurinal.com/uploads/1/3/2/7/132741169/xitoladutulapop-vodevuzulana-poxadeb-paxegulanajugi.pdf
    • http://nokiko.skincarebyjacquie.com/uploads/1/3/0/8/130814124/9874630.pdf
    • http://wededuda.runwildandbe.com/uploads/1/3/2/8/132814930/xiliguli.pdf
    • http://rorex.ashleykelley.com/uploads/1/3/1/8/131871433/zojosusimiv-lubajiba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/5864/1573/files/24084704527.pdf
    • https://cdn.shopify.com/s/files/1/0436/4448/5790/files/caballo_de_troya_5.pdf
    • https://cdn.shopify.com/s/files/1/0432/8567/6188/files/fixavenotexotaporepopig.pdf
    • https://cdn.shopify.com/s/files/1/0441/0313/9480/files/athenaion_politeia_aristoteles.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/55258178385.pdf
    • https://cdn.shopify.com/s/files/1/0431/8530/7808/files/70676914270.pdf
    • https://cdn.shopify.com/s/files/1/0438/3234/4736/files/romanesque_art_and_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0431/5670/1348/files/alter_ego_a1_answers_dossier_4.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jezimix.pdf
    • https://cdn.shopify.com/s/files/1/0452/2138/0247/files/pulseaudio_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9285/files/maserinijituwulude.pdf
    • https://cdn.shopify.com/s/files/1/0436/2692/2146/files/xixobosejofeja.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_off00008001.bin
ab031b93072beba34417811f54199ed3afb64f9654097834412315789bd9433a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8001 5120 bytes
font_01_sfnt_off00009180.bin
7439d85f7aa5cba8a6e08496bf068220a8913e25ab468a5d2fa58963822a3152		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9180 10704 bytes

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