Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7f69762c98b3d7…

MALICIOUS

PDF

45.3 KB Created: 2020-10-09 00:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 718df512601eee5a0a3352eba9c01f22 SHA-1: 624788e6dc0aa496e436f8bdd8c9e41995643de9 SHA-256: 5b7f69762c98b3d7cbde48cc753d9c054e39921d79733a07a2d89643aba53aff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution T1071.001 Web Protocols

The PDF document contains embedded links that impersonate PayPal to lure users into clicking a malicious URL. The ML classifier strongly indicated maliciousness, and the link is associated with known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the malicious URL and appears to be a phishing lure.

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://ttraff.club/pify?keyword=discord+spam+bot+free+nitro.
  • 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.club/pify?keyword=discord+spam+bot+free+nitro In PDF document text
    • https://site-1039731.mozfiles.com/files/1039731/6318255864.pdfIn PDF document text
    • https://site-1040094.mozfiles.com/files/1040094/renuxeworaxaf.pdfIn PDF document text
    • https://site-1037858.mozfiles.com/files/1037858/6343585471.pdfIn PDF document text
    • https://site-1038604.mozfiles.com/files/1038604/51656010595.pdfIn PDF document text
    • https://site-1037102.mozfiles.com/files/1037102/pomavoraxagadutofora.pdfIn PDF document text
    • https://site-1036651.mozfiles.com/files/1036651/mujezajab.pdfIn PDF document text
    • https://site-1038913.mozfiles.com/files/1038913/58737044882.pdfIn PDF document text
    • https://site-1048567.mozfiles.com/files/1048567/24877507347.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/1/0430/6799/8359/files/34200465158.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3185/4247/files/tizuregiwuxamapu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/3196/8155/files/2005_dodge_grand_caravan_gas_mileage.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1551/0952/files/jubojabagek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8070/4405/files/14293031552.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54e4ea04-d730-435f-8138-d53856a373b2/72059071235.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_off00007227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7227 5408 bytes
SHA-256: 3a73bb8a4b913f1e2c74ffb3b37f0b37a3cdbfec76f5bf1513f636d8c9e11660
font_01_sfnt_off00008473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8473 10512 bytes
SHA-256: 9555cae3d15a3ca07ced25b5414c2857cb87138883e58abdcaca135fae5a386a

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