Malicious PDF — malware analysis report

Static analysis result for SHA-256 15153fcf4da1b072…

MALICIOUS

PDF

41.3 KB Created: 2020-09-08 02:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b21cb9a1002374d0f72568f966ee40e SHA-1: 29597f26d95e9aa56a7c51334aa9ba9b415ea25d SHA-256: 15153fcf4da1b072b1597e253a1e576db540523837fa26ccdc6010da2619bd83
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The document body, though heavily obfuscated, contains the same URL and a reference to 'email id validation in android example', likely a lure. The presence of numerous Shopify links, some benign and some potentially part of a link farm, further supports a malicious intent to obscure the true destination.

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.link/wix?keyword=email+id+validation+in+android+example
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4683/7151/files/free_coloring_sheets_back_to_school.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5113/files/1006475921.pdf
    • https://cdn.shopify.com/s/files/1/0462/4384/0160/files/28139364447.pdf
    • https://cdn.shopify.com/s/files/1/0440/8236/4566/files/book_of_revelation_powerpoint_presentation.pdf
    • https://cdn.shopify.com/s/files/1/0440/9714/2936/files/ambry_genetics_consent_forms.pdf
    • https://static.usrfiles.com/ugd/53cfc7_44015b49421849c8a82434d570f54c5b.pdf
    • https://static.usrfiles.com/ugd/a4c1fa_09c4118be222495ba83b22ebdb70a230.pdf
    • https://static.usrfiles.com/ugd/f515ca_a37ca84d958f441791969990201027eb.pdf
    • https://static.usrfiles.com/ugd/724bd4_9f7b77fc7e3645f6a0b1f9c68c0cbb5c.pdf
    • https://static.usrfiles.com/ugd/a58b01_09d8dc8fd7ad4e26bfe45ba58e45c4f7.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/bexoxurafi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9434/3829/files/jirow.pdf
    • https://cdn.shopify.com/s/files/1/0433/2191/7598/files/vovufo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5783/9254/files/wupifurup.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_off00006437.bin
081af3a188a76513540646fc037d158ebe3850022ef988fdab24415a4f092bf1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6437 5012 bytes
font_01_sfnt_off00007534.bin
315737065558788976244c10236dac18af54e8e5a43873e4d168b5df2a106a9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7534 10284 bytes