Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb3325d98a4fc0b…

MALICIOUS

PDF

63.5 KB Created: 2020-08-12 20:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2094f631327e17f24e68a6c885d77621 SHA-1: 9d3a4d048c856fe203a882b1eb7c199db83a6133 SHA-256: 8fb3325d98a4fc0b214cf1cda13e44db9031a6215ed4dde186cb44e293de2891
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=naive+bayes+machine+learning+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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.com/pify?keyword=naive+bayes+machine+learning+pdf
    • http://files.slpwaboard.org/uploads/1/3/1/3/131380445/85394a0d45a2.pdf
    • http://toxima.ahlivintage.com/uploads/1/3/1/4/131409090/9677578.pdf
    • http://zasova.jemoweryandsoninc.com/uploads/1/3/0/8/130813612/galikoko.pdf
    • http://files.libbiessimplejoys.com/uploads/1/3/0/8/130873987/susufariripiv.pdf
    • https://cdn.shopify.com/s/files/1/0438/0285/3538/files/psychological_theories_of_religion.pdf
    • https://cdn.shopify.com/s/files/1/0434/0203/5351/files/dexadiwor.pdf
    • https://cdn.shopify.com/s/files/1/0427/8219/5879/files/anxiety_test_questionnaire.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vizinedidobirefeguj.pdf
    • https://cdn.shopify.com/s/files/1/0437/9571/0113/files/62617363261.pdf
    • https://cdn.shopify.com/s/files/1/0439/8913/9614/files/93994948409.pdf
    • https://cdn.shopify.com/s/files/1/0440/8508/4310/files/jozug.pdf
    • https://cdn.shopify.com/s/files/1/0440/5365/9798/files/ferigajami.pdf
    • https://cdn.shopify.com/s/files/1/0430/4342/2359/files/44559457950.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8674/files/77109207563.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/kenmore_sewing_machine_parts.pdf
    • https://cdn.shopify.com/s/files/1/0429/9957/8773/files/11932551494.pdf
    • https://cdn.shopify.com/s/files/1/0432/4058/7431/files/case_study_interview_questions.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_off0000ae55.bin
d245bbe8f7cb71d26d50e8cec6273a4a490892a21ba340af3027217d95ed3f06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE55 5840 bytes
font_01_sfnt_off0000c20f.bin
0963226abfe0f58c4d042accedac304bed866843f6a4da41d11d51c5ed000bdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC20F 14912 bytes

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