Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff856f96a460e37c…

MALICIOUS

PDF

40.9 KB Created: 2020-10-17 13:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25febbea384892ca9505c2711120b28b SHA-1: 3da8fd778ef5be13aaab36c7e538d29717e4d682 SHA-256: ff856f96a460e37cdab25c81cd3bc584d6e89b969d807ebaec8a8ef687870e74
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a utility for converting PDF to OCR Word. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier strongly indicates maliciousness. The document body and embedded URLs suggest a lure to a malicious site, likely for further exploitation or credential harvesting.

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.me/123?keyword=convertir+pdf+a+ocr+word
    • https://cdn-cms.f-static.net/uploads/4367621/normal_5f8748647b4cd.pdf
    • https://wozuwonasanava.weebly.com/uploads/1/3/1/4/131483955/240019804c.pdf
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/9653445.pdf
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/filavesunigin.pdf
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/4f2db.pdf
    • https://nulixedupalaz.weebly.com/uploads/1/3/0/7/130739510/warizipobigodi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3882/5887/files/parallel_lines_and_transversals_quiz_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0462/7342/9661/files/65511405149.pdf
    • https://cdn.shopify.com/s/files/1/0428/6378/8188/files/tipos_de_proyectos_arquitectonicos.pdf
    • https://cdn.shopify.com/s/files/1/0495/4577/3208/files/criminal_minds_best_episodes_season_2.pdf
    • https://cdn.shopify.com/s/files/1/0266/8419/5014/files/mudipuxusupuwigakulakez.pdf
    • https://cdn.shopify.com/s/files/1/0435/5273/5391/files/columbia_county_board_of_supervisors.pdf
    • https://cdn.shopify.com/s/files/1/0498/8105/5390/files/16378861841.pdf
    • https://cdn.shopify.com/s/files/1/0496/8244/8541/files/brasil_tv_new_apk_download_para_pc.pdf
    • https://uploads.strikinglycdn.com/files/1f4fba18-db4e-41bb-9bc5-902cceada9ff/rojemadudogiguruvifot.pdf
    • https://uploads.strikinglycdn.com/files/1f28c296-2709-4d8c-8f14-240b4dd3ec95/75249177392.pdf
    • https://uploads.strikinglycdn.com/files/6239babf-f089-4104-b87b-4af04eb7df85/30161202534.pdf
    • https://uploads.strikinglycdn.com/files/157eb51c-0982-4c57-8e2d-670f33aa1c92/46314017457.pdf
    • https://uploads.strikinglycdn.com/files/5ad0c23d-fecc-4666-abe3-8b657c50e04f/redijomaw.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/
    • https://uploads.strikinglycdn.com/files/157eb51c-0982-4c57-8e2d-670f33aa1c9

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006093.bin
625c3fcb313b7d0d0e6a7bb24980079a1cca06c343feaaed52e298d14e9a5e0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6093 4996 bytes
font_01_sfnt_off000071b1.bin
054dc3326a32d5fb3ccc8aeb4779934e4bacf9de13f09cb45191773b3897e551		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B1 11580 bytes

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