Malicious PDF — malware analysis report

Static analysis result for SHA-256 d762a833d3cf3fe8…

MALICIOUS

PDF

46.3 KB Created: 2020-10-28 17:25:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc31b021d8e390779821bb8a639bb156 SHA-1: d764d70d00fde6cef01e4685202a6bbd98e01244 SHA-256: d762a833d3cf3fe87dd563f14c14880a170993faa72e185d3c8261178bc399f6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though partially corrupted, contains a URL that matches the one identified by the heuristic. This suggests the primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

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://gettraff.ru/123?keyword=nocturne+in+e+flat+major+information
    • https://cdn-cms.f-static.net/uploads/4367961/normal_5f890b7d163ef.pdf
    • https://cdn-cms.f-static.net/uploads/4405652/normal_5f9644e356483.pdf
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f8a085d1d06a.pdf
    • https://cdn-cms.f-static.net/uploads/4368958/normal_5f87c7bdb4055.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0503/9207/2342/files/turelotofadofamuvidimuron.pdf
    • https://cdn.shopify.com/s/files/1/0435/7105/2703/files/ging_cee_ng_uchicago.pdf
    • https://cdn.shopify.com/s/files/1/0502/5421/7388/files/hangouts_2.3_free_apk_download.pdf
    • https://cdn.shopify.com/s/files/1/0484/6996/7013/files/43340062807.pdf
    • https://cdn.shopify.com/s/files/1/0438/6160/6550/files/texikawepomuxavedowetazo.pdf
    • https://cdn.shopify.com/s/files/1/0496/2746/3833/files/warframe_stalker_drops.pdf
    • https://cdn.shopify.com/s/files/1/0503/3879/1582/files/download_daftar_riwayat_hidup_2020.pdf
    • https://cdn.shopify.com/s/files/1/0502/2072/8478/files/glen_ellyn_park_district_activity_guide.pdf
    • https://cdn.shopify.com/s/files/1/0502/1155/3473/files/73153716342.pdf
    • https://uploads.strikinglycdn.com/files/e245140c-ba38-454a-846d-da79d1caf954/verbe_2me_groupe_liste.pdf
    • https://uploads.strikinglycdn.com/files/fbf0e079-5ddb-4c30-9b43-43b0746d800e/let_me_speak_domitila.pdf
    • https://cdn.shopify.com/s/files/1/0499/9151/6310/files/gonubelizuzeluleg.pdf
    • https://uploads.strikinglycdn.com/files/cee6e701-b5c6-4f4b-8725-b81661a29985/68496522166.pdf
    • https://cdn.shopify.com/s/files/1/0266/9271/4685/files/binary_code_practice_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0266/9432/0304/files/manual_download_windows_10_1809.pdf
    • https://cdn.shopify.com/s/files/1/0495/8686/4278/files/oconee_county_schools_sc.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000788d.bin
78c59ca5c115148e768aa8535ac074b912a3bcea5db8c1868594a349542530c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x788D 4892 bytes
font_01_sfnt_off00008925.bin
9a8b50146823735876f9a56bcfdab30ad921dcac37e182ea8f25f07c9962e300		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8925 10348 bytes

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