Malicious PDF — malware analysis report

Static analysis result for SHA-256 70382b893f09e298…

MALICIOUS

PDF

43.3 KB Created: 2020-10-02 19:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 10ae01d6c28784a00151ed34ac6f7c83 SHA-1: d5c6a8fccbdc15ffe350b875ab560655e604b959 SHA-256: 70382b893f09e2982c67413faecbdc6c9cbd23f9fe79b512cdeb5e6524e43dc0
184 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to external PDF files hosted on disposable domains, indicating a link farm or SEO poisoning tactic. One of the embedded URLs, 'https://ggtraff.ru/strik?keyword=clinical+virology+richman+pdf', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and contains junk data, but the presence of the malicious redirector URL and the link farm structure are strong indicators of malicious intent, likely to drive traffic to malicious sites or distribute further malware.

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://ggtraff.ru/strik?keyword=clinical+virology+richman+pdf In PDF document text
    • https://site-1036695.mozfiles.com/files/1036695/62007308284.pdfIn PDF document text
    • https://site-1039214.mozfiles.com/files/1039214/68949677294.pdfIn PDF document text
    • https://site-1037163.mozfiles.com/files/1037163/85690912880.pdfIn PDF document text
    • https://site-1039689.mozfiles.com/files/1039689/wikijetajoziritawavodad.pdfIn PDF document text
    • https://site-1037903.mozfiles.com/files/1037903/13179938842.pdfIn PDF document text
    • https://site-1038360.mozfiles.com/files/1038360/82219134979.pdfIn PDF document text
    • https://site-1042511.mozfiles.com/files/1042511/pedujuwulido.pdfIn PDF document text
    • http://files.unismunc.org/uploads/1/3/0/7/130775653/mawatano-bukox.pdfIn PDF document text
    • http://files.woodworkerhowardlobb.com/uploads/1/3/0/7/130740323/timod_xofatixil_supapilibegi.pdfIn PDF document text
    • http://files.coloradocowboycalendar.org/uploads/1/3/0/8/130874394/2116871.pdfIn PDF document text
    • http://sijoxebil.kissmybunslv.com/uploads/1/3/1/4/131437421/879369e9.pdfIn PDF document text
    • http://files.duluthfinepianos.com/uploads/1/3/1/0/131070712/sebogibufajun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6442/9217/files/psn_pkg_decrypter__extractor_v1.85.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7968/7587/files/4_and_goal_unblocked_2016.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9951/5816/files/81098442669.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5148/2278/files/57223538568.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/2147/8306/files/inclusion_exclusion_principle_probability.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBA 5456 bytes
SHA-256: 608d256d1e364f284ad6baf268b418293d758d405c4c8516cba4f7ca18b22f8e
font_01_sfnt_off00007e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E2F 9908 bytes
SHA-256: b12e8c28b7efb8253987700e45abc1431e9177ad161329a90a50d852f306426f

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