Malicious PDF — malware analysis report

Static analysis result for SHA-256 06464a062a8b5e22…

MALICIOUS

PDF

50.9 KB Created: 2020-08-12 22:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f519d00d40648d9b1d2ffbc964ce61d6 SHA-1: c2b8cbe542634d899835fdb6f1a1088c829c7ff5 SHA-256: 06464a062a8b5e22d625acee2a9488da9e19d59d4ecab10661780ded7dfd5d6c
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 hosted on Shopify. The primary malicious URL, https://ttraff.cc/wb?keyword=worksheet%20for%20class%203%20evs%20ncert, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this malicious URL and other PDF files, suggesting a lure to download further content or redirect to malicious sites. No scripts were extracted, but the PDF structure and embedded links strongly indicate a malicious intent to redirect users.

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.cc/wb?keyword=worksheet%20for%20class%203%20evs%20ncert
    • http://files.andrewmarkel.com/uploads/1/3/0/7/130739826/537f73448fd86.pdf
    • http://files.hoopstraining.com/uploads/1/3/0/7/130739996/digebup.pdf
    • http://files.storiainternazionale.org/uploads/1/3/0/8/130874233/792326a9b00041f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/5269/3669/files/bukojusof.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/59577082877.pdf
    • https://cdn.shopify.com/s/files/1/0427/7298/8071/files/tadozutelasatasebewu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3553/3218/files/prontuario_cemento_armato_santarella.pdf
    • https://cdn.shopify.com/s/files/1/0429/1356/2787/files/8691127164.pdf
    • https://cdn.shopify.com/s/files/1/0431/0777/8717/files/ponunanebuzogabaledod.pdf
    • https://cdn.shopify.com/s/files/1/0431/0797/5335/files/84617643324.pdf
    • https://cdn.shopify.com/s/files/1/0434/2926/5574/files/47787563125.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/taridulozomoxekolakinuku.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9952/files/pilewesokapatebagor.pdf
    • https://cdn.shopify.com/s/files/1/0433/0048/7332/files/29946407708.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9477/files/73007653951.pdf
    • https://cdn.shopify.com/s/files/1/0430/4293/0842/files/61097810062.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a00.bin
50783ef99f6aeb1a93c39838ee047d00fd2f63db182d6218d54fb2fb38781a96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A00 5272 bytes
font_01_sfnt_off00006bf5.bin
1b7399783cab615e72726ee69b5abd8c87986855270aba2b66736f2ef3c29daf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF5 7144 bytes
font_02_sfnt_off00008013.bin
6689c834797ea0f2fa1eda6daf4bf27c3cfd87c8f5f12bd295222bf290fd39ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8013 10552 bytes
font_03_sfnt_off0000a44a.bin
c1e6ffc75750c5739b28184ea098192487e1c360ff13057a509a4a6bbbe05e79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA44A 17492 bytes

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