Malicious PDF — malware analysis report

Static analysis result for SHA-256 898d3736f3602760…

MALICIOUS

PDF

40.3 KB Created: 2020-08-10 05:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7873f750eda55716a230b62900ca23ba SHA-1: 4758a80cfb2e654d6fb6f1106524b274ffe8901c SHA-256: 898d3736f3602760fcd1a7176e0b982389567c5834fd6c4a76fd7435ad1fecb5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary redirector URL identified is https://ttraff.cc/pify?keyword=grammar+games+esl+pdf, which is flagged as malicious. The document's structure and embedded links suggest an attempt to lure users to potentially harmful content, likely for phishing or malware distribution.

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=grammar+games+esl+pdf
    • http://files.ncwaonline.org/uploads/1/3/1/6/131607163/2259126.pdf
    • http://files.rersi.com/uploads/1/3/1/4/131437276/gewilafuxin_diwasitilaxiru.pdf
    • http://files.peaksandpaddles.org/uploads/1/3/1/4/131452735/29203.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7176/6690/files/78681372189.pdf
    • https://cdn.shopify.com/s/files/1/0433/8306/2695/files/angularjs_reader.pdf
    • https://cdn.shopify.com/s/files/1/0428/9150/9919/files/56620267887.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/college_algebra_problems_and_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0439/3133/6859/files/urban_sprawl_definition.pdf
    • https://cdn.shopify.com/s/files/1/0435/0178/1156/files/vadogidibujewusorudib.pdf
    • https://cdn.shopify.com/s/files/1/0431/5057/3719/files/tebalofosod.pdf
    • https://cdn.shopify.com/s/files/1/0437/7165/8392/files/jupujenaxurotav.pdf
    • https://cdn.shopify.com/s/files/1/0435/9720/1567/files/51371651741.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/wireduk.pdf
    • https://cdn.shopify.com/s/files/1/0437/6064/8343/files/sap_basis_security_interview_questions_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32823332632.pdf
    • https://cdn.shopify.com/s/files/1/0429/7729/6543/files/tomuxixa.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_off00006041.bin
46f9d0a7e8f6852e1a35085f0b3de6f267e536ecd5aaafbcacd423ee32fd4820		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6041 5392 bytes
font_01_sfnt_off00007284.bin
ff76546d94d2aee75d2890b123aaf0ef6242147af16b43f6de2e1376dba33ba7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7284 9940 bytes

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