Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb6b8bc6312c0d4…

MALICIOUS

PDF

38.5 KB Created: 2020-09-17 08:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec38321bed135c7c67482ac984dbe610 SHA-1: 71b16898e904bb970a2e70ca266c81ce7c71109b SHA-256: dfb6b8bc6312c0d4d481b96ca5d737530d3751f4c4f384bb4a9a2d083e33f8c8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary redirector URL is https://ttraff.com/wb?keyword=good%20dog%20carl%20by%20alexandra%20day. The ML classifier strongly indicated maliciousness, and the PDF structure supports the hypothesis of a malicious redirector.

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/wb?keyword=good%20dog%20carl%20by%20alexandra%20day
    • http://files.bluecrimsonanime.com/uploads/1/3/1/8/131857734/9895937.pdf
    • http://files.minnowphotos.com/uploads/1/3/1/8/131858661/fca5b.pdf
    • http://files.friskypress.com/uploads/1/3/2/7/132740462/sitijizef_nurusubizi_vubesemafe_binubir.pdf
    • http://gematavup.lesherosfourbus.com/uploads/1/3/2/6/132681443/nedirus-jamatefunet-nirapumomenir-digevuruvuwugut.pdf
    • http://files.loveletterpressauthors.com/uploads/1/3/0/8/130814535/xakapekamovu-ruvexir-bamodilu-loremizojiz.pdf
    • http://tusodibok.dmlcommunications.com/uploads/1/3/2/6/132683097/38c9479fdb1e.pdf
    • http://ziliri.comoxvalleyringette.com/uploads/1/3/2/6/132680955/nesavi.pdf
    • https://86ba7022-003c-4204-b998-fe89cfb49f55.filesusr.com/ugd/bf650e_8e9c768e59fb4f77a26dc8c3808a2920.pdf?index=true
    • https://774e6e6c-8743-46a0-bd14-33c532be6317.filesusr.com/ugd/1df9ea_efcb780d1ca04f2a991df27728b7c013.pdf?index=true
    • https://1d8dc1e3-2a56-421b-a2d0-acff8a810972.filesusr.com/ugd/3f80ec_04df76762ef54183a908622bc5113ef3.pdf?index=true
    • https://f93c7e63-00d0-4d0c-b2a6-cda15cea2628.filesusr.com/ugd/01e791_0f2254471a9e4e6a9befed8221e5a8d9.pdf?index=true
    • https://fb1b49e2-f962-4c44-a2f2-86a6086ea508.filesusr.com/ugd/c0fca2_a4ff7c9d392c42ce995b05fd5f0e5913.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0428/9386/9223/files/battlegrounds_battle_buddy_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/3556/5990/files/martin_elevador_de_cangilones.pdf
    • https://cdn.shopify.com/s/files/1/0458/9859/6506/files/formation_medecin_anesthesiste_suisse.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_off000057c1.bin
f5292c184f5283d175e0ab0424d3598e273f198caa1b0b4cad1fd70bc2410179		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57C1 5268 bytes
font_01_sfnt_off000069cb.bin
a2042feab625fdadb8e2693a921285e39caf109add1d96d0bc05ec23dcf1f832		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69CB 10412 bytes

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