Malicious PDF — malware analysis report

Static analysis result for SHA-256 845f34b03325d157…

MALICIOUS

PDF

43.2 KB Created: 2020-08-25 23:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 222f7bc94eb1cc01175fe51de6bbcfdd SHA-1: 01fc4760c9f4968bd2fdee9bba450fc82e96b1dc SHA-256: 845f34b03325d1577bdaf0784ccbdfcdd30ac4a48cddd6074c1685bb016cfb1d
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=way+of+the+turtle+apple', likely leads to a malicious site. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The ML classifier strongly indicates maliciousness. The primary attack pattern involves tricking the user into clicking the malicious link by presenting it as a legitimate resource.

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/pify?keyword=way+of+the+turtle+apple
    • http://files.elangamaker.com/uploads/1/3/1/3/131379748/xuxitapivu.pdf
    • https://cdn.shopify.com/s/files/1/0452/5346/0130/files/english_fal_grade_8_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/8718/3515/files/diabetes_mellitus_type_2_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/3363/2661/files/1638732295.pdf
    • https://cdn.shopify.com/s/files/1/0433/7215/0942/files/nidimebisuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/4411/8423/files/49262051037.pdf
    • https://cdn.shopify.com/s/files/1/0433/9702/1861/files/67804435643.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/bafuluvufileraziwomutifix.pdf
    • https://cdn.shopify.com/s/files/1/0462/5255/6437/files/summerslam_2018_results_bleacher_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/3730/2679/files/buvudifuvobizerojuli.pdf
    • https://cdn.shopify.com/s/files/1/0428/0041/4883/files/3517176456.pdf
    • https://cdn.shopify.com/s/files/1/0432/7391/2488/files/pibovese.pdf
    • https://cdn.shopify.com/s/files/1/0437/0956/3045/files/desactivar_advertencia_de_uso_de_datos_android.pdf
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/kigir.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87294954422.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_off00006c2b.bin
fe439bef84b23e9bdb15ef446939e028ef9e8af2bf5a5a91cfbcfedc9a6db8a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C2B 4924 bytes
font_01_sfnt_off00007cfb.bin
50a23e69f9b9883256f8f77f76c8c42bd8915ef4c4014ad530d4d7a735dc5c8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CFB 10192 bytes