Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fedbdff0192a914…

MALICIOUS

PDF

63.7 KB Created: 2020-10-17 00:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8e713224751bc150ee7b86427a75e99 SHA-1: 42e18b5942521be404fde9174a3076ea4a4b50c4 SHA-256: 2fedbdff0192a9141525a1ec90a697a3cbe2dbde92025819fdb301b89bf67daa
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL that is likely intended to be clicked by the user, leading to the 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.club/123?keyword=ensayo+critico+ejemplo+pdf
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/80db941676d0.pdf
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/1beae7928cd13.pdf
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/vutoz.pdf
    • https://fusesekomufe.weebly.com/uploads/1/3/1/6/131606177/samevevefiw_pokovad.pdf
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/dulefipalep_jobowajoxugo_wiribulelom_nuzigo.pdf
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/fufime_wimawevogodevoj.pdf
    • https://cdn.shopify.com/s/files/1/0486/2931/7790/files/regevazuwevumadivo.pdf
    • https://cdn.shopify.com/s/files/1/0481/8383/6839/files/xurozopirititudox.pdf
    • https://cdn.shopify.com/s/files/1/0430/6803/1143/files/area_code_780_time.pdf
    • https://cdn.shopify.com/s/files/1/0480/7242/5636/files/oath_of_devotion_gods.pdf
    • https://cdn.shopify.com/s/files/1/0500/5380/8288/files/ayame_sohma_voice_actor_2019.pdf
    • https://cdn.shopify.com/s/files/1/0502/4002/8837/files/ratatouille_online_free_movie.pdf
    • https://cdn.shopify.com/s/files/1/0436/5330/0377/files/17589942807.pdf
    • https://cdn.shopify.com/s/files/1/0432/1692/8923/files/business_intelligence_and_analytics_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/3872/7589/files/circuits_fill_in_the_missing_words_answers.pdf
    • https://cdn.shopify.com/s/files/1/0500/0658/9595/files/depreciation_in_accounting.pdf
    • https://cdn.shopify.com/s/files/1/0491/8191/7350/files/el_tratado_de_tordesillas.pdf
    • https://uploads.strikinglycdn.com/files/e9c7249a-8162-4604-8090-b6389761c5f6/familazelojizuzep.pdf
    • https://uploads.strikinglycdn.com/files/5f886694-71d3-4452-b3ce-06177455ece7/mimeguvegese.pdf
    • https://uploads.strikinglycdn.com/files/c1cc4659-557e-4c28-b55b-24bd3374e4eb/rajitamavoxutegimojaxe.pdf
    • https://uploads.strikinglycdn.com/files/e03e6ba0-8bd0-4261-ba8c-66da35175ea1/rumigefikuxabi.pdf
    • https://uploads.strikinglycdn.com/files/60e22a9c-85c1-44d2-a757-917287848cd2/63878061657.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/
    • https://cdn.shopify.com/s/files/1/0432/1692/8

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8a7.bin
1b9a5a39eb2168d1dd6c67d00ff0d39b39aa37438df344a5d1d8002b6d915b10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A7 5436 bytes
font_01_sfnt_off0000cb1c.bin
0a059dc8f1ad25e40c6044db576df30ca96bed128fcb80fbc8fb96c8ee6fdb5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1C 11256 bytes

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