Malicious PDF — malware analysis report

Static analysis result for SHA-256 6035141c4db0c488…

MALICIOUS

PDF

41.3 KB Created: 2020-08-25 21:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c39fb8bc9742401bb9e65c4a9d493f82 SHA-1: 95bb198b05cfae52f0c0160dbb73ae8b5feb10bb SHA-256: 6035141c4db0c4889eb66dfcecb80db5d272faf3f6c7e20fcbf1d8356fcfa4cb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service designed to obscure the final destination. The primary malicious URL identified is a redirector that attempts to masquerade as a link to interview preparation materials. While no scripts were extracted, the PDF structure and embedded links strongly suggest a phishing or redirection attempt.

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/pify?keyword=the+product+manager+interview+164+actual+questions+and+answers+pdf+download
    • http://nojesoga.safespacesupervision.co.uk/uploads/1/3/2/6/132695839/8017293.pdf
    • http://wotenulug.placercountyreviewagency.com/uploads/1/3/1/6/131636733/jiruxus.pdf
    • http://files.popmetals.com/uploads/1/3/0/9/130969546/dewoxibu.pdf
    • http://files.tictheater.com/uploads/1/3/1/6/131606262/1007059.pdf
    • http://files.paddlerivergolf.com/uploads/1/3/1/1/131164009/e0b74ad145b6cef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/6461/4303/files/academic_writing_skills_cambridge_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/5377/7047/files/normal_delivery_baby_video_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/7455/0950/files/powarov.pdf
    • https://cdn.shopify.com/s/files/1/0429/7264/3491/files/hping3_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/9080/4885/files/nejikazenibitizanexasik.pdf
    • https://cdn.shopify.com/s/files/1/0465/4674/7542/files/smokey_and_the_bandit_theme_song.pdf
    • https://cdn.shopify.com/s/files/1/0429/4914/8828/files/square_breathing_exercise.pdf
    • https://cdn.shopify.com/s/files/1/0438/7025/7320/files/xosekosifutibidikugekeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/86526592296.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/55783448207.pdf
    • https://cdn.shopify.com/s/files/1/0438/2025/3344/files/brooklyn_99_season_4_episode_11.pdf
    • https://cdn.shopify.com/s/files/1/0435/3599/0943/files/prepositional_phrases_list_and_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/felamisakawubibaxejurelok.pdf
    • https://cdn.shopify.com/s/files/1/0452/2383/7856/files/oc_caste_list_in_telangana.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000542c.bin
440e7c21a6dfad0621572957a97a39b8007028893156b56addaa7e0f37d33bb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x542C 5972 bytes
font_01_sfnt_off00006876.bin
ad2ce5a78395e57f4f9e8e5a5135483801c724162307b5af2cd01328e47cc8dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6876 9616 bytes
font_02_sfnt_off00008935.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8935 4324 bytes

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