Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9e9bfbe0542084…

MALICIOUS

PDF

53.7 KB Created: 2020-08-25 14:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2735fe3798351892c6a74af3278ab79b SHA-1: 44d728ebceb147ad77a328161080acaf6fa43936 SHA-256: aa9e9bfbe05420848350ca0b02910db9dd9bade1100082559c2b84a6c89398bc
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=bsf+ka+form+kab+nikalta+hai'. Another heuristic indicates a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body is heavily obfuscated, preventing a deeper analysis of the lure's content.

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.ru/pify?keyword=bsf+ka+form+kab+nikalta+hai
    • http://mabeza.innerserenitymidwifery.com/uploads/1/3/1/4/131437622/nafotiroxusaparolop.pdf
    • http://pavit.frracing.net/uploads/1/3/0/8/130814310/9426209.pdf
    • http://files.sharkassault.com/uploads/1/3/0/7/130775145/aaa81e8a.pdf
    • https://cdn.shopify.com/s/files/1/0437/0441/8458/files/bard_of_blood_novel_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/7022/5574/files/vapeborujetujexi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5193/4108/files/adding_and_subtracting_fractions_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/0002/0635/files/mawokiboves.pdf
    • https://cdn.shopify.com/s/files/1/0427/4782/2236/files/58320660037.pdf
    • https://cdn.shopify.com/s/files/1/0445/4989/8399/files/adjetivos_para_describir_personalidad_en_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0437/9725/0205/files/zubutidopinikalu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4396/1504/files/71630784511.pdf
    • https://cdn.shopify.com/s/files/1/0435/1652/6752/files/75453821298.pdf
    • https://cdn.shopify.com/s/files/1/0441/2735/5032/files/vivopejafuvis.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/krishna_s_textbook_probability_theory.pdf
    • https://cdn.shopify.com/s/files/1/0431/4621/5584/files/code_39_barcode_scanner_android.pdf
    • https://cdn.shopify.com/s/files/1/0428/5369/5644/files/oh_ho_bandeya_song.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fc4.bin
b5ccb2d3a600d89af03e91a2b1a9c1d5b12ae359b00ecaf4e4402471a938fe63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC4 5260 bytes
font_01_sfnt_off00008175.bin
6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8175 3720 bytes
font_02_sfnt_off00008cd8.bin
646df9450bec80a94f1e70c82f64f4bb17bba1c63182e1cca1b69594e672e96f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD8 10292 bytes
font_03_sfnt_off0000b027.bin
23c8459664c2a97697dc5e19699ae38cbb3fbe07d76092c7aff6ff5930a0c21f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB027 6864 bytes

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