Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed7e70b82669e11…

MALICIOUS

PDF

49.8 KB Created: 2020-08-25 22:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 324032f700729e28a4a428aee0422d07 SHA-1: 3dc44f3312f42b57c589935027194ee2b3d70660 SHA-256: 7ed7e70b82669e11254ba865ec07cea141503b37a09a90f02ce4695c263be9ff
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded URLs, many of which lead to a redirector service. This indicates a likely attempt to lure users to malicious or deceptive content, potentially for phishing or to distribute further malware. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=clang+implicit+instantiation+of+undefined+template
    • http://files.the-beaver-house.com/uploads/1/3/1/4/131454316/2622033563744.pdf
    • http://files.mocins.com/uploads/1/3/1/0/131070938/guvaw_mevogaraxigiwu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6104/1569/files/pavud.pdf
    • https://cdn.shopify.com/s/files/1/0431/6086/2882/files/retamukuduse.pdf
    • https://cdn.shopify.com/s/files/1/0433/8758/4675/files/xigeg.pdf
    • https://cdn.shopify.com/s/files/1/0429/5376/9126/files/tanoniw.pdf
    • https://cdn.shopify.com/s/files/1/0430/1137/5267/files/buxivukaruzaxuseda.pdf
    • https://cdn.shopify.com/s/files/1/0434/5777/3725/files/85690193721.pdf
    • https://cdn.shopify.com/s/files/1/0439/2163/7544/files/frozen_2_4k_trailer.pdf
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/mometomigimalituguterub.pdf
    • https://cdn.shopify.com/s/files/1/0432/5516/9182/files/algorithme_arbre.pdf
    • https://cdn.shopify.com/s/files/1/0428/1909/2647/files/lupizeliloboxutalubib.pdf
    • https://cdn.shopify.com/s/files/1/0431/2127/9137/files/16816910167.pdf
    • https://cdn.shopify.com/s/files/1/0428/9649/0655/files/graphing_quadratic_functions_standard_form_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0441/3086/1208/files/ffxiv_act_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000788e.bin
7bc2e598b6f4cc65128653ce8ec9172ce6587a7cbffa0697338ac6dee2f66c2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x788E 5284 bytes
font_01_sfnt_off00008a73.bin
457a54b5c3d7f044ed5d6d9c49a402b52c75d8162d338d93b240bb8e1187089a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A73 15188 bytes