Malicious PDF — malware analysis report

Static analysis result for SHA-256 c073f2de7a4c825d…

MALICIOUS

PDF

63.8 KB Created: 2020-08-11 13:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d2384b3d5477bf1b5a5c6a9d314301a SHA-1: 3dafeacb0281f3bb3820a2a7b1d3dc4f5f83f33f SHA-256: c073f2de7a4c825d9f2b99d0f42a18e3ec80bcb3c00d14506c8b33b4410a4ae5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=teoria+finalista+da+a%25C3%25A7%25C3%25A3o+pdf'. Additionally, a PDF SEO link farm heuristic indicates the presence of numerous external PDF links, with the first being 'https://cdn.shopify.com/s/files/1/0433/3407/4523/files/gevarunalajob.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body contains obfuscated text and the malicious URL, suggesting a lure to a phishing or scam 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=teoria+finalista+da+a%25C3%25A7%25C3%25A3o+pdf
    • http://files.davenportbasketball.com/uploads/1/3/1/0/131069890/jenon-fijuj-vutonov.pdf
    • http://files.jenniferhainesmua.com/uploads/1/3/1/3/131381288/tamubil_lijifiwamizuzin_bidasel_vijevifalenosiv.pdf
    • http://files.littleemshop.com/uploads/1/3/0/7/130775446/2062652.pdf
    • http://files.rytiskonst.com/uploads/1/3/1/0/131070485/860871.pdf
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/gevarunalajob.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/75051367967.pdf
    • https://cdn.shopify.com/s/files/1/0439/7996/4574/files/62826872600.pdf
    • https://cdn.shopify.com/s/files/1/0429/9007/6057/files/lefijopusujinanoguke.pdf
    • https://cdn.shopify.com/s/files/1/0432/6054/3138/files/65440607559.pdf
    • https://cdn.shopify.com/s/files/1/0428/1221/1359/files/vinisusubugonirabapu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/generic_learning_outcomes.pdf
    • https://cdn.shopify.com/s/files/1/0431/2681/6932/files/type_casting_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ziwodukujaluladiludu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/fomujuzusutokaro.pdf
    • https://cdn.shopify.com/s/files/1/0439/9667/6254/files/pedep.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_off0000b648.bin
b615d3b1a80075b1c0fff6492ab9e6210b6452fbc2adb4ce573f8fbc94e93cbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB648 5484 bytes
font_01_sfnt_off0000c85e.bin
1d72cd9cfb80d4c6c62afd658e517f43bba748cef656a1457bba207bbbfa4522		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC85E 13356 bytes

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