Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28aea8cf9592722…

MALICIOUS

PDF

43.4 KB Created: 2020-08-21 17:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddac3619be4ac5d63d46792afe9bae93 SHA-1: 25d00e36276dcc2766b1b5f2eeae06de3a2ae885 SHA-256: f28aea8cf95927225a16d0640f4755a9812549d008a86164a676188997e1ce99
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a prominent link disguised as a "Cydia app link" that directs to a malicious redirector. The document also hosts a large number of external PDF links, many of which point to Shopify domains, suggesting a link farm or content distribution network used for hosting malicious files. The ML classifier strongly indicated maliciousness.

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/pify?keyword=cydia+app++link
    • http://files.1as.ency-education.com/uploads/1/3/2/6/132696111/vipasidisutofevugej.pdf
    • http://files.actioneducation.co.nz/uploads/1/3/0/7/130739719/wosera.pdf
    • http://nobimow.braverybox.com/uploads/1/3/0/8/130813528/jipikipofadaj_xajefarurize.pdf
    • http://files.littlefurfriends.com/uploads/1/3/0/9/130969655/6399251.pdf
    • http://files.icsc-companies.com/uploads/1/3/1/3/131380612/4829110.pdf
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/files/tafheem_ul_quran_english.pdf
    • https://cdn.shopify.com/s/files/1/0430/5852/8405/files/galuwopenuvasimejus.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8674/files/resorobekodoroto.pdf
    • https://cdn.shopify.com/s/files/1/0427/7259/4844/files/blood_and_thunder_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8798/files/18692245194.pdf
    • https://cdn.shopify.com/s/files/1/0430/0632/8995/files/resize_mac_a3_to_a4.pdf
    • https://cdn.shopify.com/s/files/1/0429/0763/1779/files/zajekalemegadasanarurek.pdf
    • https://cdn.shopify.com/s/files/1/0432/3953/8851/files/cms_guidelines_for_hepatitis_a_vaccine.pdf
    • https://cdn.shopify.com/s/files/1/0430/7124/2391/files/schrodinger_wave_equation.pdf
    • https://cdn.shopify.com/s/files/1/0438/8693/6219/files/guidelines_for_the_management_of_aneurysmal_subarachnoid_hemorrhage.pdf
    • https://cdn.shopify.com/s/files/1/0430/8316/9943/files/come_monday_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0433/4642/8072/files/craftsman_26_snowblower.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9585/files/98228912223.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_off00006c8d.bin
972d90a5ea9842b7393c8ddabd10a0a5d37b2998bd11d4bf54833f1b2db32d73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8D 4748 bytes
font_01_sfnt_off00007cd1.bin
c6547d2702dd4fd5646ba155dbc8ceade2851bc5c0c4ae9bfb493211d1de775f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD1 10596 bytes

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