Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4f1e14a819bba8…

MALICIOUS

PDF

37.5 KB Created: 2020-08-25 14:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0487d03eebce438c91fe39879fb48a3 SHA-1: 8db9286c30b4de884c8a29fbf02a957e25bcb664 SHA-256: 0b4f1e14a819bba8bc910cd242afdcb91e05e2e65f1f8b0f1dabb8366be73b88
202 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to a known malicious redirector infrastructure. The document body also contains a link to a redirector and several links to PDF files hosted on Shopify, some of which are likely part of a link farm. The ML classifier also strongly indicated maliciousness. The presence of numerous links suggests an attempt to direct users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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=vivah+full+movie++worldfree4u
    • http://nadaxakos.annettebarkerabundantlyblessedministries.com/uploads/1/3/2/6/132681670/futiwewolipivu.pdf
    • http://penev.eloquentasfuck.com/uploads/1/3/0/7/130739204/5806475.pdf
    • http://gaseran.joshbroussard.com/uploads/1/3/2/7/132740873/85ec5378.pdf
    • http://files.centralparkcomplex.com/uploads/1/3/0/7/130775027/xuraxoluvumut_vefitezigug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8974/0441/files/dumujo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40573574370.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7650/files/proxy_switcher_chrome.pdf
    • https://cdn.shopify.com/s/files/1/0428/2214/0063/files/magizijarawidewave.pdf
    • https://cdn.shopify.com/s/files/1/0449/1807/9655/files/49802587307.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/51408458795.pdf
    • https://cdn.shopify.com/s/files/1/0431/5342/4540/files/brew_install_psql.pdf
    • https://cdn.shopify.com/s/files/1/0434/8402/0898/files/80258369665.pdf
    • https://cdn.shopify.com/s/files/1/0430/7219/2669/files/derimoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/9612/1251/files/list_of_cities_in_kansas.pdf
    • https://cdn.shopify.com/s/files/1/0430/8415/2986/files/ated_online_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8274/files/antenatal_screening_guidelines_uk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9111/6700/files/jikivakegepib.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_off00005363.bin
7ab90eb23e966aa8563073c2b7ba120767e24b1d57acce6fc8c7b50c7478323e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5363 5176 bytes
font_01_sfnt_off000064fd.bin
92dee46c647c7c7457c9156d878f4244bce9d49296effea29d8503e6b9851eb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64FD 10564 bytes

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