Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece8762469a49b03…

MALICIOUS

PDF

51.0 KB Created: 2020-08-22 04:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8d15f7713756e2714e33d1486e593c1 SHA-1: b816b211e0f2c0cfc22826deb3c870da90c44275 SHA-256: ece8762469a49b0300b835906c5a609ffd66c88d28d4b2c567af05e06e6a3234
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, many of which point to a link farm hosted on Shopify, but one critical link redirects to a known malicious infrastructure at ttraff.ru. The document body, though heavily obfuscated, contains text suggesting it is a 'metric conversion worksheet answer key' and includes the malicious URL. This indicates a social engineering lure designed to trick users into visiting a malicious site.

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=metric+conversion+worksheet+1+answer+key
    • http://gapomaz.legallysweettreats.com/uploads/1/3/1/3/131398101/2434519.pdf
    • http://zisagaw.kelly-johnston-art.com/uploads/1/3/1/1/131164250/c0e341dd3ed9829.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/tipujozudolavijevales.pdf
    • https://cdn.shopify.com/s/files/1/0431/3595/9191/files/24815785465.pdf
    • https://cdn.shopify.com/s/files/1/0431/6119/0554/files/ramis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/webomobituwisumepepaxifi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9875/8557/files/dozifijugok.pdf
    • https://cdn.shopify.com/s/files/1/0437/0441/8455/files/48331022460.pdf
    • https://cdn.shopify.com/s/files/1/0432/0532/9064/files/3792929372.pdf
    • https://cdn.shopify.com/s/files/1/0437/9531/6893/files/7153183955.pdf
    • https://cdn.shopify.com/s/files/1/0435/4736/1439/files/da_form_1687.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9760/files/pakeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/6395/8938/files/braun_series_7_type_5697_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/8219/4852/files/gagizebapini.pdf
    • https://cdn.shopify.com/s/files/1/0437/5396/3678/files/algebra_worksheets_year_9.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f26.bin
4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F26 2828 bytes
font_01_sfnt_off00008921.bin
c1b342a9974c698341650b3f274f06b1157f90b2044e5d1e229d35a854de49d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8921 5232 bytes
font_02_sfnt_off00009b10.bin
0084d9cef8161f5a04994a47d54f3885beaee67b52270c3147a4221b2b702e6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B10 9876 bytes

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