Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa56f5ace92656a6…

MALICIOUS

PDF

43.7 KB Created: 2020-08-22 01:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1ce1e21d134060868777ea900127bbe SHA-1: f8fe2b19689eb9af85245b222217ed37cfca1311 SHA-256: aa56f5ace92656a644e5545d5d2a0a079fc972d5d49aa9c377f6e28335260ffc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious Link

The PDF file was identified as malicious due to multiple critical heuristic firings indicating it links to known malicious redirectors and hosts a large number of external PDF links. The ML classifier also strongly flagged this sample. The primary malicious URL identified is https://ttraff.com/pify?keyword=bengali+movie+hd+video+song, which is likely used to redirect users to further malicious content or phishing sites.

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/pify?keyword=bengali+movie+hd+video+song
    • http://files.nejoudalyagout.com/uploads/1/3/2/6/132682990/pajup-xalolaluketo.pdf
    • http://maravifo.sassyarabia.com/uploads/1/3/0/8/130874426/2567911.pdf
    • http://fubivare.skateteamindy.com/uploads/1/3/2/3/132303093/f6d1d9cb9afd4be.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0071/files/zowunixasadubikesinewi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8973/files/watevaguvonejalofufuwa.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3387/files/business_intelligence_manager_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0433/6192/7318/files/wurirokipubivijunor.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/how_to_use_japanese_abacus.pdf
    • https://cdn.shopify.com/s/files/1/0435/0921/9492/files/kelosixafofoduwagipav.pdf
    • https://cdn.shopify.com/s/files/1/0428/8849/5270/files/a_brief_history_of_seventh_day_adventist.pdf
    • https://cdn.shopify.com/s/files/1/0431/4290/6007/files/pdf_file_ko_jpg_kaise_banaye.pdf
    • https://cdn.shopify.com/s/files/1/0431/6463/1189/files/44929890553.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/42233638036.pdf
    • https://cdn.shopify.com/s/files/1/0429/0392/8991/files/4440534914.pdf
    • https://cdn.shopify.com/s/files/1/0437/6874/2046/files/zijuzevusix.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_off000061ec.bin
cd9a7da356a960d8a5ad4addd51aa66d7ed08450e2ba2f6b3e249e1336b360cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61EC 4960 bytes
font_01_sfnt_off00007296.bin
ba1b48453950ae91f6bae51208677ccc874c7ccf8d9ce08180604c91c8ea8c32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7296 9784 bytes
font_02_sfnt_off00009408.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9408 4324 bytes

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