Malicious PDF — malware analysis report

Static analysis result for SHA-256 0632edeb541eebe6…

MALICIOUS

PDF

49.8 KB Created: 2020-08-17 06:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50419fa78eea84dd40f616853d1f17e6 SHA-1: 55f693a58c87aa23d76978eb596022640c7028b2 SHA-256: 0632edeb541eebe688886ac927453ee876755d3d54c5a1df1eb371df13311dd8
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are benign Shopify links but one is a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of a download button heuristic further supports a malicious intent to trick the user into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ssc+result+2019+apps
    • http://wumezim.motionxsynergy.com/uploads/1/3/2/6/132683188/jevimibej_razer.pdf
    • http://files.metroapplianceservice.com.au/uploads/1/3/1/1/131163920/kesomokikuvalokod.pdf
    • http://napivada.ergoholdings.com/uploads/1/3/1/3/131379362/tilila.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8615/1834/files/66817536344.pdf
    • https://cdn.shopify.com/s/files/1/0437/9515/3058/files/9635607030.pdf
    • https://cdn.shopify.com/s/files/1/0438/8821/4171/files/download_myspace_music.pdf
    • https://cdn.shopify.com/s/files/1/0430/1389/8403/files/80832459932.pdf
    • https://cdn.shopify.com/s/files/1/0432/2338/4219/files/asphalt_pavement_design.pdf
    • https://cdn.shopify.com/s/files/1/0437/0851/4455/files/hallelujah_jeff_buckley_piano.pdf
    • https://cdn.shopify.com/s/files/1/0437/9901/9682/files/90248269477.pdf
    • https://cdn.shopify.com/s/files/1/0434/9339/2536/files/heart_of_worship_chords_key_of_e.pdf
    • https://cdn.shopify.com/s/files/1/0433/4046/4281/files/unifi_ssh_commands.pdf
    • https://cdn.shopify.com/s/files/1/0432/7938/4734/files/mathematics_reference_books_for_class_12.pdf
    • https://cdn.shopify.com/s/files/1/0429/8797/8913/files/bovobowasebe.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/
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bf1.bin
6c19c4d7dd08789ecbec33af5a4ccbe539a80de3c0eba50cc8ad8213e0a726ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF1 5512 bytes
font_01_sfnt_off00007eb1.bin
4bd252324aa700743c48d1a1cad8af485d36ac3fb9e2cef41968ab87dbc98063		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB1 6000 bytes
font_02_sfnt_off0000921f.bin
1cf6efda23e42c9c981ec24a08ba48e24b1c31abbbd96f61afbc1022e2cd5fab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x921F 12476 bytes

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