Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1795490b4ba6a4…

MALICIOUS

PDF

45.2 KB Created: 2020-08-12 11:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6d386a0831b1eaffedfb13a0b87d15c SHA-1: e566f80508e999af70caf9ac1ee550791b4da5a3 SHA-256: fc1795490b4ba6a42e9c4c84ad6700708dc495b6bb85288b29aff448217abba8
154 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 indicating a malicious redirector. The primary malicious URL, https://ttraff.com/wb?keyword=constructor%20in%20java%20with%20example%20program%20pdf, is identified as a redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=constructor%20in%20java%20with%20example%20program%20pdf
    • http://files.piperspillows.com/uploads/1/3/1/3/131378779/pifokawefoxi.pdf
    • http://files.indyfertilitycare.com/uploads/1/3/1/3/131383771/terogikobiposom_pojal_natexedemit_salifis.pdf
    • http://files.elizabethkpetersonlab.com/uploads/1/3/1/3/131384789/sibufajoj-xuvini.pdf
    • http://files.hunterscourt.com/uploads/1/3/1/4/131452982/bomisutuguzufe_rivezemamizip.pdf
    • https://cdn.shopify.com/s/files/1/0434/4184/8470/files/15309651388.pdf
    • https://cdn.shopify.com/s/files/1/0436/2895/3763/files/emulsion_polymerization_mechanism.pdf
    • https://cdn.shopify.com/s/files/1/0431/7616/5536/files/squid_allow_all.pdf
    • https://cdn.shopify.com/s/files/1/0429/0818/8839/files/jizazarakiko.pdf
    • https://cdn.shopify.com/s/files/1/0437/7142/9016/files/99984521310.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/17132895393.pdf
    • https://cdn.shopify.com/s/files/1/0432/1017/8717/files/32248422527.pdf
    • https://cdn.shopify.com/s/files/1/0438/3621/1362/files/biocalculus_calculus_for_the_life_sciences.pdf
    • https://cdn.shopify.com/s/files/1/0427/7764/1116/files/2906307159.pdf
    • https://cdn.shopify.com/s/files/1/0439/4788/4702/files/american_english_file_3.pdf
    • https://cdn.shopify.com/s/files/1/0454/5613/0200/files/87202309794.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18187133080.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_off00006f88.bin
abf5af7c2635346c0f017e16dd9725d9b6439b6adf3042701c4abda4464671c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F88 5772 bytes
font_01_sfnt_off0000831c.bin
4016ab3ff3d19b68ff08e5499b99e6ebf0c608a6667d400553dcf04cbdd09ee8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x831C 11456 bytes

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