Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbcfd4b5bdff077…

MALICIOUS

PDF

43.1 KB Created: 2020-09-01 02:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2babaf8fda7dad8c69072dd880cf64f7 SHA-1: 51a16dcddac7251ecabfef0d064de4f181818b9c SHA-256: efbcfd4b5bdff077c8a0807abc93c54c022ccd1f083ca3b99913209984011111
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is used to serve lures for potentially unwanted software. The document body and embedded links suggest a social engineering attempt to trick users into downloading a fake Adobe Flash Player update. 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.ru/wix?keyword=adobe+flash+player+11.+7+apk
    • https://cdn.shopify.com/s/files/1/0437/6923/3565/files/91247799142.pdf
    • https://cdn.shopify.com/s/files/1/0464/7210/2056/files/swiftkey_themes_free.pdf
    • https://cdn.shopify.com/s/files/1/0457/7037/5324/files/buzuwezedax.pdf
    • https://cdn.shopify.com/s/files/1/0430/6924/3549/files/94371786558.pdf
    • https://cdn.shopify.com/s/files/1/0434/2222/0439/files/garmin_nuvi_200_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/2303/0693/files/aambala_songs_download_isaimini.com.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/jebuvulejelimogi.pdf
    • https://cdn.shopify.com/s/files/1/0467/7369/8713/files/transistor_2n3904_datasheet_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0428/3501/7884/files/agenda_semibold_font.pdf
    • https://static.usrfiles.com/ugd/289c5e_dec557459a40435388dde85dae4b9d06.pdf
    • https://static.usrfiles.com/ugd/cdb50c_29de0279c1984a08b4ff095b831a11a2.pdf
    • https://static.usrfiles.com/ugd/3826db_2ed513553d844b6ebb3318d8f269dd2a.pdf
    • https://static.usrfiles.com/ugd/f96b02_04d93b37232f4283a4aa87237bb763f3.pdf
    • https://cdn.shopify.com/s/files/1/0434/5869/1232/files/67733051420.pdf
    • https://cdn.shopify.com/s/files/1/0430/7035/7661/files/darogaxagive.pdf
    • https://cdn.shopify.com/s/files/1/0440/7217/3733/files/encyclopedia_judaica_vol_10.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/geometria_descriptiva_aplicada_a_la_arquitectura.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_off00004b9b.bin
593d161c4779b7dc5abca763320e1328d8af6753cd8e963c04ada212ba3c3deb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B9B 10264 bytes
font_01_sfnt_off00006c50.bin
b652c3fadbeeaa8d6ba84ab78e2d735de3f7721923db94ab8e33a03711960067		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C50 5588 bytes
font_02_sfnt_off00007f5e.bin
7e7452c0318bdef1884a039cb08c8ca0f6b5ae52ffdb7332ddae5bc541e55348		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F5E 9412 bytes

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