Malicious PDF — malware analysis report

Static analysis result for SHA-256 6306a170c9230f7b…

MALICIOUS

PDF

48.7 KB Created: 2020-08-19 00:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbffa5445369bb69072c0a782ae01db5 SHA-1: 1e3bcbcd05e61565d0dbd1458ff54a045126c4b0 SHA-256: 6306a170c9230f7b47e261edc1d89816829af234f158ac1c928393d07ce66b2c
162 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 redirector service known to host malicious content. The document body also contains a direct link to this redirector, suggesting an attempt to trick users into downloading further malicious content or visiting a malicious site. The ML classifier strongly indicates maliciousness.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/pify?keyword=assamese+video+song++website
    • http://files.cdipuertorico.com/uploads/1/3/2/3/132302759/2022972.pdf
    • http://files.ramelia-images.co.uk/uploads/1/3/1/4/131437953/9861279.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2666/9987/files/alternatives_to_google_maps_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/4925/4048/files/losufuzopamal.pdf
    • https://cdn.shopify.com/s/files/1/0432/4166/8775/files/refem.pdf
    • https://cdn.shopify.com/s/files/1/0432/8577/4502/files/rails_delete_table.pdf
    • https://cdn.shopify.com/s/files/1/0430/8588/9689/files/fatal_no_such_remote_origin.pdf
    • https://cdn.shopify.com/s/files/1/0428/6336/2204/files/73541146177.pdf
    • https://cdn.shopify.com/s/files/1/0431/5208/1053/files/30861302630.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2084/files/limodifinu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/51863514774.pdf
    • https://cdn.shopify.com/s/files/1/0441/3207/3624/files/bejotoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/xuvokiwefibizimopili.pdf
    • https://cdn.shopify.com/s/files/1/0433/7369/1045/files/zawizusasewupi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0799/1195/files/fanuc_robot_teach_pendant_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/5080/3099/files/manual_do_proprietrio_cbx_200_strada.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bf6.bin
4309e1486d5dfa2c9b32ba526d3475fd9315698b325bec161bce8a979a1ab4e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF6 5300 bytes
font_01_sfnt_off00007dfa.bin
c844facd9cb7a57ff8fdc354cf098602b1c4b8be62f03c276afd0b41e9c78bf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DFA 6364 bytes
font_02_sfnt_off000092e1.bin
656dfef9b22d095a0b91c62dfbb2520b22d560c8656d7a0dbe0dd3459bb5014d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92E1 10100 bytes

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