Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4fd82d2544c8d0…

MALICIOUS

PDF

41.3 KB Created: 2020-08-12 16:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f921d5a165e0839d2f5e6b07a819c01c SHA-1: 3a5da5284aba09ef34c1082dcb08503969d3e1dc SHA-256: ef4fd82d2544c8d05ac0179289dbe22fcc05230dc40904a4b43e8f7a14ac43b4
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a link farm pointing to a known malicious redirector. The primary redirector URL is https://ttraff.com/pify?keyword=angular+tutorial+pdf+tutorialspoint, which likely serves as a lure to obscure the ultimate malicious destination. The ML classifier also strongly indicated maliciousness.

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=angular+tutorial+pdf+tutorialspoint
    • http://pukanirat.kelseyleach.com/uploads/1/3/1/6/131637136/salenizesojok-forokadasitew.pdf
    • http://files.lknailsandbeauty.co.uk/uploads/1/3/2/6/132681938/wovaxale.pdf
    • http://files.lyricmgmt.com/uploads/1/3/0/7/130775768/gupezafu-legelazawipopu-dopejoz-datapinuzusik.pdf
    • http://rakapujaj.withmelshelp.com/uploads/1/3/0/9/130969465/govej-nopitasezuzef-binojedol-vukinizosi.pdf
    • http://files.neinvitational.com/uploads/1/3/1/6/131636946/6544350.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6359/files/5959020221.pdf
    • https://cdn.shopify.com/s/files/1/0434/0065/9100/files/mazuzozog.pdf
    • https://cdn.shopify.com/s/files/1/0428/0451/0887/files/52026099693.pdf
    • https://cdn.shopify.com/s/files/1/0436/9671/7977/files/mupukudolebaxalan.pdf
    • https://cdn.shopify.com/s/files/1/0428/5323/6902/files/wunumagexadavelipadofa.pdf
    • https://cdn.shopify.com/s/files/1/0435/5499/6383/files/english_to_assamese_dictionary_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/9397/3405/files/60195229668.pdf
    • https://cdn.shopify.com/s/files/1/0435/3848/1320/files/juguzusaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/runafibeda.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/40785250908.pdf
    • https://cdn.shopify.com/s/files/1/0436/9262/1978/files/psychology_9th_edition_myers.pdf
    • https://cdn.shopify.com/s/files/1/0429/8119/5927/files/java_fx_pane.pdf
    • https://cdn.shopify.com/s/files/1/0437/9780/7265/files/liserugijuzosa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063ef.bin
bbdc9eeec25278a71ef4f06fc057668e53ae7ff49bb8e3d813afeae1fff327d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63EF 5200 bytes
font_01_sfnt_off000075ad.bin
7741b46d361e6787d126f2911899dffa46f4c43c8a6be791dc8e4e45b2eeb2c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75AD 10092 bytes

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