Malicious PDF — malware analysis report

Static analysis result for SHA-256 06871fa3f7d522de…

MALICIOUS

PDF

51.8 KB Created: 2020-09-19 02:39:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec6fc5bf1bc2e01e679312e652860cb6 SHA-1: 66a5ce55c593d801bdbf6b8f8b023bcd8a65b4c6 SHA-256: 06871fa3f7d522de8e11dd6a8b9e90b3b2d0613b2062d5cd80594b33872d6adb
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a study guide answer key, which redirects to malicious infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the malicious nature of the target URL. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document body and embedded links 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.club/wix?keyword=world+history+midterm+study+guide+answers
    • http://lupol.shariphillips.ca/uploads/1/3/1/8/131856698/moxikibetunamoxi.pdf
    • http://wogorame.innovationsdanceplatform.co.uk/uploads/1/3/2/7/132712116/740518.pdf
    • http://tajud.stellarlanes.ca/uploads/1/3/0/7/130739906/kofevolobedagib-gimar-mifomoxesekebu-zolozuf.pdf
    • http://files.wouterbergenhuizen.com/uploads/1/3/2/7/132712139/9520341.pdf
    • http://files.stuarts2gabon.com/uploads/1/3/0/9/130969862/tewosuxum-vilotupaparo-wukejujojamudu.pdf
    • http://files.eating-normal.com/uploads/1/3/1/4/131437753/bepukal_jovawazewusan_xibititilutezev.pdf
    • http://files.canceledweddings.com/uploads/1/3/1/4/131482975/lifaganidesa.pdf
    • http://files.makercenterusa.com/uploads/1/3/1/4/131407877/ripagoraripaxivaje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/mdadm_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3876/files/guxalagovezemama.pdf
    • https://cdn.shopify.com/s/files/1/0438/8428/2008/files/viva_video_maker_with_song_app.pdf
    • https://cdn.shopify.com/s/files/1/0432/6529/4504/files/android_failed_binder_transaction_bitmap.pdf
    • https://cdn.shopify.com/s/files/1/0431/0879/4525/files/bearshare_free_music_ing_program.pdf
    • https://cdn.shopify.com/s/files/1/0439/5129/2584/files/baixar_facebook_apk_lite.pdf
    • https://cdn.shopify.com/s/files/1/0435/9671/0050/files/36870466105.pdf
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/solezevukagamujofefusimol.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_off00007dab.bin
842ba48ab81cbfebbb3b0394fae0c2e213ab619820ace85a3e9dc3a0bff975bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DAB 5328 bytes
font_01_sfnt_off00008fb9.bin
a58cf684d144f2dab8623a8040e152b94db894f2a18a3af80c9f1b3ecd5ee0dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FB9 10540 bytes
font_02_sfnt_off0000b3b5.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B5 4324 bytes

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