Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b35d236e143567…

MALICIOUS

PDF

34.6 KB Created: 2020-08-31 11:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a49609f25beb007f8116d048c6ddab0 SHA-1: 20fbaa59af28ea444c51b2ff1501a7313d45c480 SHA-256: a7b35d236e143567dd561d678509876365bac42fbdcdf0c44ed6840cecfb81bc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a prominent link that redirects to a malicious domain, disguised with a keyword related to popular media downloads. This indicates a social engineering lure to drive traffic to malicious infrastructure. The PDF also contains a large number of external links, many of which point to a domain hosting numerous PDF files, suggesting a link farm or SEO poisoning tactic. No scripts were extracted, and the document body is heavily obfuscated, but the primary malicious intent is clear from the redirector link.

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.club/wix?keyword=breaking+bad+season+3+download
    • https://static.usrfiles.com/ugd/b8c837_3011a4f3a1d545b59a2c0ab3f6444fef.pdf
    • https://static.usrfiles.com/ugd/6f7357_72aaad31cace48f199af0d1eecdd6ec0.pdf
    • https://static.usrfiles.com/ugd/b8c837_0bc1ede77aa94822997b17a2ec2f8ec1.pdf
    • https://static.usrfiles.com/ugd/aef5b7_cce9f1ffa0f3439fb4673e46c0a6b9f5.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/92032260023.pdf
    • https://cdn.shopify.com/s/files/1/0433/8201/4119/files/essentials_of_economics_10th_edition_ebook.pdf
    • https://cdn.shopify.com/s/files/1/0441/0081/2952/files/expresiones_idiomaticas_en_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0440/3340/9174/files/computer_science_class_11_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/9494/1603/files/gogulipenimikiraduxodun.pdf
    • https://static.usrfiles.com/ugd/e643da_9602d7ec893b41ffa0af2f3860fe411d.pdf
    • https://static.usrfiles.com/ugd/5438e3_5eb96b5e64d64459ad9fb490ca868cda.pdf
    • https://static.usrfiles.com/ugd/4b874d_9f876c0384104e96a05bb870f611f0e9.pdf
    • https://static.usrfiles.com/ugd/9b5f63_2479a5c7e7264ee78d4918eb78bbe9e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_189295f9b67f465890b07b2c896eb7bb.pdf
    • https://cdn.shopify.com/s/files/1/0431/7170/9092/files/15829951744.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9560/files/83216504191.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_off0000499a.bin
bc94b1f08280fa77a4fc9756e41d9fd7551924b06685ec0b64d135f93d559cab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x499A 5504 bytes
font_01_sfnt_off00005c74.bin
ef1e6ba5ebc8ad37fac02739a77ed9d022e97637c3e4c773c6654255cae42f5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C74 9616 bytes

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