Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bce8f7d3e74b1ab…

MALICIOUS

PDF

43.5 KB Created: 2020-08-07 18:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cce77182a83bdb54231469549d75ddb8 SHA-1: 33f24cc6aefe5047fc916a93b5ef74d3632fdc76 SHA-256: 8bce8f7d3e74b1abb6a49d7f488e7d94055e00bb1ed0bdfb15c757f787c73cbe
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a link to a known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=best+pdf+app+for+ipad+pencil'. Another critical heuristic identified a PDF link farm, suggesting a tactic to artificially inflate search engine rankings or distribute malicious links. The document body, though heavily obfuscated, contains references to these URLs, reinforcing the malicious intent. No scripts were extracted, but the PDF structure and embedded links strongly indicate a phishing or redirection attack.

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.com/pify?keyword=best+pdf+app+for+ipad+pencil
    • http://files.intentionalenrichment.com/uploads/1/3/0/7/130775484/nixenuz.pdf
    • http://files.fpcroswell.org/uploads/1/3/2/6/132682681/pazikegilor_nubugipejapuv.pdf
    • http://files.sobrightandbeautiful.net/uploads/1/3/2/6/132682542/vutit.pdf
    • https://cdn.shopify.com/s/files/1/0438/1881/1552/files/kegizezowakejolazate.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1935/files/medifodivikexasigukuxi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/anandamela_pujabarshiki_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6951/files/90743873275.pdf
    • https://cdn.shopify.com/s/files/1/0432/6617/9230/files/48118917259.pdf
    • https://cdn.shopify.com/s/files/1/0451/7157/2885/files/phenol_formaldehyde_resin_manufacturing_process.pdf
    • https://cdn.shopify.com/s/files/1/0431/9235/2932/files/fizolawutatatilopizuwuba.pdf
    • https://cdn.shopify.com/s/files/1/0437/1234/8315/files/neuropathy_diabetes.pdf
    • https://cdn.shopify.com/s/files/1/0432/2259/7796/files/digezalawemobutozipir.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/31251032293.pdf
    • https://cdn.shopify.com/s/files/1/0439/3464/6440/files/fafadi.pdf
    • https://cdn.shopify.com/s/files/1/0427/4470/9276/files/vezupevatomumo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8277/files/damezitufotagasino.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cf6.bin
c809cf6636f4d5bd3401dead2813e75a150332ae3ff1695f6157e4c5845a7718		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF6 5200 bytes
font_01_sfnt_off00007eb4.bin
4374a0da38a5c99e07baa660b4c9371c03dfe80c0083ca446551c9c8f5648556		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB4 10024 bytes

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