Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df782591bf83ecc…

MALICIOUS

PDF

42.0 KB Created: 2020-08-03 12:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13292095863611bb182e9b20b27516fc SHA-1: 2ce9b980895a9239ffb47e807f016cc76a258b6f SHA-256: 0df782591bf83eccbe51cf390f22cf3440527ef8541a8e2baa927e0f7b0955f3
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector at 'https://ttraff.com/pify?keyword=analise+sintatica+portugues+pdf'. The document body, though heavily obfuscated, contains text that appears to be a lure for Portuguese language analysis, and also embeds a link to a PDF hosted on a potentially compromised domain. The presence of many external PDF links suggests a link farm or redirection strategy to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=analise+sintatica+portugues+pdf
    • http://files.castletreeandlandscaping.com/uploads/1/3/1/4/131438248/xedokabolidumid.pdf
    • http://files.shallowatereducationfoundation.org/uploads/1/3/0/9/130969966/71f26a2c3daf85.pdf
    • http://files.michelleclarkvm.co.uk/uploads/1/3/2/3/132303269/kisebafopiwuke_pafumew.pdf
    • http://files.alexjstampfl.com/uploads/1/3/0/9/130969204/podoxibedibogoxofate.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3206/8775/files/pituvesarunetavabukotoxu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4061/3286/files/vitezopinorolirodi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wimuwukewamofese.pdf
    • https://cdn.shopify.com/s/files/1/0447/5686/1077/files/connect_to_smb_share_from_mac_terminal.pdf
    • https://cdn.shopify.com/s/files/1/0434/0174/0439/files/negevibitaxuxe.pdf
    • https://cdn.shopify.com/s/files/1/0435/8602/7677/files/76389357905.pdf
    • https://cdn.shopify.com/s/files/1/0427/9068/2783/files/59892996149.pdf
    • https://cdn.shopify.com/s/files/1/0432/3082/2555/files/ladijoxanukozebewife.pdf
    • https://cdn.shopify.com/s/files/1/0440/5651/0616/files/vemokinavuwupesivagufime.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23158701460.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xazome.pdf
    • https://cdn.shopify.com/s/files/1/0431/3281/3473/files/virtualbox_boot_camp.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fejatomamegebuwugibuvu.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_off000065c3.bin
a3733285d130f91696c16d63cb43d775bfacd51d517af6109e5e6514ff72d5d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65C3 5312 bytes
font_01_sfnt_off000077e4.bin
64a3aa1723ff7161da364841fcf0cf127bdce813e9757d782516416eae858b59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77E4 10312 bytes

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