Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db8d43b50de6c9d…

MALICIOUS

PDF

48.8 KB Created: 2020-08-22 15:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0856022e8bd3c87fa9e4c236550c8c19 SHA-1: 790737aa90cd831dbd639b50b15851f6990eb36f SHA-256: 2db8d43b50de6c9dfb3c8f04781fbfc9510a3626b8b7d5d72d5411a14902b420
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector infrastructure, specifically `https://ttraff.com/pify?keyword=ssn+aptitude+test+syllabus+question+papers`. This URL is presented within the document body, disguised as information about "Ssn aptitude test syllabus question papers". The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to obscure the malicious destination. The ML classifier strongly flagged this PDF as malicious.

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=ssn+aptitude+test+syllabus+question+papers
    • http://juvidek.marytilakmd.com/uploads/1/3/2/3/132302870/kopuwipeb.pdf
    • http://files.1nk-immunotherapyconf.com/uploads/1/3/0/7/130740517/4c6761.pdf
    • http://wived.pocushub.com/uploads/1/3/0/8/130813834/6ec34e03807d.pdf
    • http://rizopi.ramseymunicipalpool.com/uploads/1/3/1/4/131453574/podevezasosuvo_buwizopojexoka_zamaxo_takulijetu.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/magisterium_book_1.pdf
    • https://cdn.shopify.com/s/files/1/0432/1814/1341/files/ketaga.pdf
    • https://cdn.shopify.com/s/files/1/0434/5652/8537/files/android_set_top_box_walmart.pdf
    • https://cdn.shopify.com/s/files/1/0434/6917/6985/files/70008433166.pdf
    • https://cdn.shopify.com/s/files/1/0430/8366/1461/files/italy_visa_information_book_appointment.pdf
    • https://cdn.shopify.com/s/files/1/0433/1179/2286/files/12829048999.pdf
    • https://cdn.shopify.com/s/files/1/0431/4313/5393/files/campbell_sinh_hc.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/analogue_and_digital_signal.pdf
    • https://cdn.shopify.com/s/files/1/0434/0069/1862/files/nugamakujisalimexojorola.pdf
    • https://cdn.shopify.com/s/files/1/0431/4211/9592/files/olaudah_equiano_slave_narrative.pdf
    • https://cdn.shopify.com/s/files/1/0430/9434/3834/files/multistage_amplifier_design.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/serabikisemijepurixovoji.pdf
    • https://cdn.shopify.com/s/files/1/0433/7886/8387/files/ipl_2020_schedule_time_table_file_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/8614/1847/files/pirates_of_the_caribbean_theme_sheet_music.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_off0000684e.bin
bdd2a58710f13e9b5e9a5a012ef7a8c8913e945b93acdddf06c324fb120f47d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x684E 5424 bytes
font_01_sfnt_off00007abd.bin
9286d8c9fdb51bf6763f11449830f70caef4cef79fff5693ed949e5b089601ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ABD 10432 bytes
font_02_sfnt_off00009e4b.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E4B 16164 bytes

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