Malicious PDF — malware analysis report

Static analysis result for SHA-256 985d86424bae53ed…

MALICIOUS

PDF

39.1 KB Created: 2020-08-09 20:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5cf9fc11694a73d1dbd8b94000a2cf7 SHA-1: 38b5d31aaebe6e8fe8e5ee7d924237b776b324f6 SHA-256: 985d86424bae53ed4adc914cd538bcc289d5058577dbc02643bc5746af475270
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The primary malicious URL is https://ttraff.com/pify?keyword=greek+and+latin+root+worksheets+pdf, which is likely part of a phishing or scam campaign. The document body, though heavily obfuscated, contains references to the same URLs, reinforcing the malicious intent.

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=greek+and+latin+root+worksheets+pdf
    • http://files.pilitconsulting.com/uploads/1/3/1/8/131856012/f3c13.pdf
    • http://files.rosamiliafornjea.org/uploads/1/3/1/3/131381046/eae383ab76ad.pdf
    • http://files.4dancebasics.com/uploads/1/3/2/6/132695714/webitu.pdf
    • http://files.terryshistory.com/uploads/1/3/0/9/130969699/duxogabogeseto.pdf
    • https://cdn.shopify.com/s/files/1/0437/2843/7409/files/45663756689.pdf
    • https://cdn.shopify.com/s/files/1/0427/7967/2735/files/tuxududolulesezuxo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9798/1082/files/91083289995.pdf
    • https://cdn.shopify.com/s/files/1/0431/3966/1981/files/bacon_s_essays_summary.pdf
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/radimaki.pdf
    • https://cdn.shopify.com/s/files/1/0439/4565/6488/files/standard_metric_thread_size_chart.pdf
    • https://cdn.shopify.com/s/files/1/0431/3730/2690/files/87728007113.pdf
    • https://cdn.shopify.com/s/files/1/0433/4456/0281/files/pevixorulekoxufaduwav.pdf
    • https://cdn.shopify.com/s/files/1/0437/4275/7029/files/81457516705.pdf
    • https://cdn.shopify.com/s/files/1/0429/9092/8026/files/vozolinevefuro.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3447/files/72891992642.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e94.bin
f522d269d589a81a600e989a6ebaa0d89b1da2950670bd69c124a89ff8b7eb58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E94 5104 bytes
font_01_sfnt_off00006000.bin
d05135cbf38763aa9e95a0e08a7d96b628f5ea8857612e39b1377e28e9b7a9a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6000 9788 bytes
font_02_sfnt_off0000816e.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x816E 4324 bytes

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