Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4eb28b6ce1c618…

MALICIOUS

PDF

42.8 KB Created: 2020-09-17 18:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 805cb81195026fb4bacb0ad55362e78e SHA-1: bd7620e4711cda0a4ef44cf59d7c0eebf29a2292 SHA-256: 7f4eb28b6ce1c618462097926b817adc1c5855634afb8df8921aba160ebdbcbb
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting and are likely part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting the document's primary purpose is to direct users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.link/wix?keyword=renny+ottolina+hijas
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://50f1579b-82b4-4220-bd6f-f2cc61431dcf.filesusr.com/ugd/f95141_7d62fc20af31432988c220b9d68309d7.pdf?index=true
    • https://771fce43-e1e2-45d2-80a5-3f178adf6148.filesusr.com/ugd/c8f33b_b27e4aa930d144a59bfbe6bc327d0d69.pdf?index=true
    • https://6bd85d16-c574-4b08-8925-8ffd64b1ef68.filesusr.com/ugd/dc8a8e_39c1c306146f4aabade5f0c2057e1f6d.pdf?index=true
    • https://dee32cb3-53af-45d0-b146-1d797c7a3329.filesusr.com/ugd/10cedf_4f95f0a1de4545cbb91a0f51f0ec5658.pdf?index=true
    • https://c17bbb29-12ca-40d4-866c-b513e0c33382.filesusr.com/ugd/84a5c6_12529c82fe62490ea0b4c7f7fb0b48a4.pdf?index=true
    • https://f84d6b5b-05c1-4496-8047-2ef538f065b5.filesusr.com/ugd/7d1dc9_52473fda43e34b7d97b5f2d877fac18f.pdf?index=true
    • https://6236e643-c21b-446d-a427-a726608078aa.filesusr.com/ugd/1e4819_15273784acca45fab4dc09b65e18ad6d.pdf?index=true
    • https://dde93aa2-837c-4b98-abf1-40b80f3be65b.filesusr.com/ugd/ff68bb_2ef21238285c4d82bb45dc9f2ec79a4e.pdf?index=true
    • https://6a36553a-d054-4d59-b8e2-8c1278adac76.filesusr.com/ugd/1cc7e8_341ecfa62d544f668dbbda2eb63d9374.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0432/4212/7527/files/basic_logic_gates_in_digital_electronics.pdf
    • https://cdn.shopify.com/s/files/1/0437/8044/0215/files/abelian_group.pdf
    • https://cdn.shopify.com/s/files/1/0437/9131/9201/files/windows_10_1903_update_microsoft.pdf
    • https://cdn.shopify.com/s/files/1/0437/6828/3294/files/soferenavaselizax.pdf
    • https://cdn.shopify.com/s/files/1/0433/7015/2088/files/vocabulary_workshop_level_c_unit_12_answers_synonyms_and_antonyms.pdf
    • https://cdn.shopify.com/s/files/1/0432/8331/6891/files/56509476520.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_off000069c6.bin
eb424f78c2b753707b9f876cfd25e0e0a6f2ab0d723c1d1182eee07c160a4f59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69C6 4864 bytes
font_01_sfnt_off00007a5a.bin
bdcb5ad75aa8ef04c84937054071937e7cb6588dc11c4d6b0dc3826651508946		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5A 10716 bytes

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