Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a4e68c15fa87be…

MALICIOUS

PDF

51.5 KB Created: 2020-08-06 17:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13a24030e24b285071901efab7c8bb90 SHA-1: ea4d5e4dea9d41f5751d7011d3d33226385849dc SHA-256: 15a4e68c15fa87be7997ed7c96b8fcd97bb1b389a1f52e58805fca4ecd36d8de
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically to `https://ttraff.com/pify?keyword=tratamiento+nutricional+para+osteoporosis+pdf`. This heuristic, combined with a high ML classifier score, indicates a malicious redirector attempt. The document body, though obfuscated, contains the same lure text and URLs, reinforcing the phishing pretext.

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=tratamiento+nutricional+para+osteoporosis+pdf
    • http://files.naacpcorvallisbranch.com/uploads/1/3/0/7/130738971/589a5ee63d2.pdf
    • http://files.swartzshowhorses.com/uploads/1/3/1/3/131398419/7078745.pdf
    • http://vuzurupil.dragomirdesignbuild.com/uploads/1/3/0/7/130775448/3607671.pdf
    • http://files.morjimcocopalms.com/uploads/1/3/1/3/131384789/2a0aea98a146c0c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/tisukifakijapu.pdf
    • https://cdn.shopify.com/s/files/1/0438/3119/7856/files/kinowigudepisix.pdf
    • https://cdn.shopify.com/s/files/1/0429/1044/9820/files/classroom_management_strategies_for_teachers.pdf
    • https://cdn.shopify.com/s/files/1/0435/6279/5167/files/ups_certificate_of_origin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9894/8255/files/43319611942.pdf
    • https://cdn.shopify.com/s/files/1/0432/5389/1232/files/john_deere_1200a.pdf
    • https://cdn.shopify.com/s/files/1/0429/9613/8137/files/10610135544.pdf
    • https://cdn.shopify.com/s/files/1/0429/6274/7545/files/21028853258.pdf
    • https://cdn.shopify.com/s/files/1/0432/0270/7616/files/aditya_birla_scholarship_2020_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zebegevuda.pdf
    • https://cdn.shopify.com/s/files/1/0438/0783/4272/files/schindler_s_list_theme_piano_violin.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_off00007e4a.bin
f978a94348b9179dbf8af58fa4b35050ad01544e43d0375c97ab7e3cd5d7bdbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E4A 5132 bytes
font_01_sfnt_off00008f9f.bin
f37ebc9c2039939202c8e1671d44a9a7d7592cffba18beb324f3adf8b0bc1adb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F9F 10832 bytes
font_02_sfnt_off0000b2e6.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E6 4324 bytes

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