Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9ae1d67a813593…

MALICIOUS

PDF

47.2 KB Created: 2020-08-08 09:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 384c78f9aa1e594c14304f2b10b7ed00 SHA-1: 9581fa342fbcc0f1a6edfacbc63e49b539515cf0 SHA-256: 8b9ae1d67a813593dbc9f17201465eebbba4199f81f8a54bedcf5fe3b50bc3cb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a large number of embedded links, including one pointing to the malicious redirector ttraff.com. This suggests the document is designed to lure users to malicious websites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of the specific lure.

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=savaged%20by%20systemd%20pdf
    • http://files.friendsofdeddingtonlibrary.org/uploads/1/3/0/7/130739664/ae93003c33.pdf
    • http://files.sgionet.com/uploads/1/3/0/8/130874413/zujojunejiguwimurob.pdf
    • http://files.anavantage.com/uploads/1/3/1/4/131409909/duborumekojota.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0658/files/jupasiligo.pdf
    • https://cdn.shopify.com/s/files/1/0438/4754/9088/files/100_python_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/d_d_5e_urban_bounty_hunter.pdf
    • https://cdn.shopify.com/s/files/1/0428/0378/9991/files/ronanoduxazu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6290/files/kowesujumi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53975554289.pdf
    • https://cdn.shopify.com/s/files/1/0431/1017/0786/files/ethiopian_grade_12_biology_student_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/mcdonalds_collectibles_price_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/2656/0677/files/pdf_to_word_converter_free_google.pdf
    • https://cdn.shopify.com/s/files/1/0450/6599/4392/files/abaddon_s_gate_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3455/files/mudalawunifaxip.pdf
    • https://cdn.shopify.com/s/files/1/0435/2324/4191/files/real_estate_sales_manager_job_description.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f1e.bin
555c89a8189d56c6c846b05f144203d83adfb2ac2a2dfbacc2303348af88eba5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1E 5640 bytes
font_01_sfnt_off0000724f.bin
82a7ea1107cf1607b89bf8b3a8eea8387938926edc0113245decc0008eb6395c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x724F 10940 bytes
font_02_sfnt_off000097c1.bin
49230a07578f2a0b108554ff1d47b1cb24b8f8081254bad551c0ce72ea05e0a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97C1 16544 bytes

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