Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd5093c2ced24a8…

MALICIOUS

PDF

42.5 KB Created: 2020-08-11 05:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d75dedd9c146efcb47a293bd11b2738b SHA-1: 59a08f4823e26dc323a432bbf553626d4ea3a63f SHA-256: 4fd5093c2ced24a8a5d118edccf59d07373dfc24f1ca18917b602d24ee653d47
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body and embedded artifacts reveal a large number of external links, many hosted on Shopify, suggesting a link farm designed to distribute malicious content. The primary malicious URL identified is https://ttraff.cc/pify?keyword=html+link+to+pdf+open+in+browser, which likely serves as a gateway to further malicious sites.

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=html+link+to+pdf+open+in+browser
    • http://files.rajeanandcompany.com/uploads/1/3/1/8/131871817/2389356.pdf
    • http://files.odpeople.com/uploads/1/3/2/6/132695829/genufazejibeleb.pdf
    • http://files.culturelli.fi/uploads/1/3/1/8/131871569/490eb75aaa734e.pdf
    • http://files.meredithbledsoephd.com/uploads/1/3/1/4/131438202/273fe5bbd31.pdf
    • http://files.academicfreedomnebraska.org/uploads/1/3/2/7/132710627/jedetevupiguron.pdf
    • https://cdn.shopify.com/s/files/1/0437/8053/8526/files/90441159191.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tagitigupi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0707/4723/files/40802588932.pdf
    • https://cdn.shopify.com/s/files/1/0435/8363/5619/files/95755902699.pdf
    • https://cdn.shopify.com/s/files/1/0433/8168/6439/files/mathematics_past_papers.pdf
    • https://cdn.shopify.com/s/files/1/0432/1918/9915/files/books_to_read_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/2341/8019/files/vegese.pdf
    • https://cdn.shopify.com/s/files/1/0431/5270/3645/files/python_beginners_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/7747/6260/files/48461042828.pdf
    • https://cdn.shopify.com/s/files/1/0435/1400/3610/files/83017964140.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tedix.pdf
    • https://cdn.shopify.com/s/files/1/0434/6268/8918/files/antenna_and_wave_propagation_by_bakshi_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/7016/7966/files/basic_accounting_concepts_and_principles.pdf
    • https://cdn.shopify.com/s/files/1/0432/5638/1597/files/96850819649.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_off0000676a.bin
450d4b270e7defee56401728d384ff4d55d67ae5b58957be52771662c47c9182		 pdf-font-stream PDF embedded font (sfnt) at offset 0x676A 5236 bytes
font_01_sfnt_off0000792c.bin
8018de14d3b3e29a9a6410692ef7327334bf007bb8f3b491237f113a7347be9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x792C 10480 bytes

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