Malicious PDF — malware analysis report

Static analysis result for SHA-256 4396ccdcce366ee1…

MALICIOUS

PDF

45.4 KB Created: 2020-08-09 05:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 201b69ed92c565d95f5b0ce352d15701 SHA-1: d60a237f181679ba16a402bf7cda67f20bee3ac5 SHA-256: 4396ccdcce366ee1708705912949a348c14b3cbeb56bb8d5117b71b3fa28c960
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at 'https://ttraff.cc/pify?keyword=cervical+spondylitis+exercises+pdf'. This indicates a phishing or scam attempt, likely to redirect users to a malicious site. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the lure. The ML classifier also strongly flagged this PDF as malicious.

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=cervical+spondylitis+exercises+pdf
    • http://files.heavenlyangelsart.org/uploads/1/3/0/7/130740048/jipubixuledawufoju.pdf
    • http://files.letthemlearnllc.com/uploads/1/3/1/4/131438329/rofunawilugumoxo.pdf
    • http://files.aidenlee.net/uploads/1/3/0/8/130814605/2706408.pdf
    • http://files.authoroliviahowe.com/uploads/1/3/1/4/131437242/moxalufekoriti.pdf
    • http://jolunidir.cardillelab.com/uploads/1/3/0/8/130874038/a6abcc.pdf
    • https://cdn.shopify.com/s/files/1/0429/2971/7407/files/59335137411.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gefoviliruvowej.pdf
    • https://cdn.shopify.com/s/files/1/0431/1810/0637/files/poliwubirevamusijapadode.pdf
    • https://cdn.shopify.com/s/files/1/0428/2354/9094/files/geometric_patterns_grade_6.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/reragijod.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/65031556372.pdf
    • https://cdn.shopify.com/s/files/1/0433/7601/7559/files/php_abstract_class.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98973723668.pdf
    • https://cdn.shopify.com/s/files/1/0436/4759/8742/files/89888937393.pdf
    • https://cdn.shopify.com/s/files/1/0431/2373/6725/files/precalculus_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/20822443105.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9877/files/zesavoxewozetafinesok.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_off0000751f.bin
ee044d76189b9eda9fefaa0059d7d6fbcf89f997ed7efbbb8cd1ff38bb58261e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x751F 5284 bytes
font_01_sfnt_off00008732.bin
f6e0ebb06c21bb74e20dc1995dda529c3795ca0b3f5d78ba24c66667a1629576		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8732 9864 bytes

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