Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e8ba2fdbbb9798f…

MALICIOUS

PDF

36.2 KB Created: 2020-08-17 06:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcc6fed2870a69b8e8ba6ecb42a6a652 SHA-1: c98f8b5955a5f2b4da700af4d514df6546175f9f SHA-256: 1e8ba2fdbbb9798fb74a3e1efd8122c8aa4a67d10418ab8b421850434b91d691
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external PDF links, suggesting a link farm or redirection attempt. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is https://ttraff.cc/pify?keyword=black+veil+brides+wake+up, which is likely used to redirect users to further malicious content. The document body is heavily obfuscated and contains what appears to be a reconstructed URL, but it is too corrupted to be certain of its exact value.

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=black+veil+brides+wake+up
    • http://zuxuvaret.stjamesunitedregina.com/uploads/1/3/0/7/130775934/3448921.pdf
    • http://files.jobarber.com/uploads/1/3/1/3/131383977/30160f06df5eb.pdf
    • http://files.amkmusic.com/uploads/1/3/1/1/131164046/jefejutavirit.pdf
    • http://files.salembasketballofficials.org/uploads/1/3/0/9/130969408/kugigumafewos.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/seamless_black_steel_pipe_schedule_40.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2998/files/27708912817.pdf
    • https://cdn.shopify.com/s/files/1/0428/9714/6019/files/functionalism_william_james.pdf
    • https://cdn.shopify.com/s/files/1/0430/4030/9402/files/fegirotisadegigigus.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/faststone_registration_code.pdf
    • https://cdn.shopify.com/s/files/1/0437/8587/9713/files/benazir_bhutto_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0807/files/27229736756.pdf
    • https://cdn.shopify.com/s/files/1/0428/4914/0902/files/57675135944.pdf
    • https://cdn.shopify.com/s/files/1/0437/3089/4999/files/dungeon_master_guide_pathfinder.pdf
    • https://cdn.shopify.com/s/files/1/0431/8121/1802/files/lidogivevarevegelulase.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/fadifevi.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000509b.bin
743c8720d819a23134cc391ffd5eea3a8f924e4b370809ffc70c950e2e82a838		 pdf-font-stream PDF embedded font (sfnt) at offset 0x509B 5472 bytes
font_01_sfnt_off0000634b.bin
69a851e1336ea8befc18a729d620177023c055b447e9691354258e0eed15d6b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x634B 9544 bytes

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