Malicious PDF — malware analysis report

Static analysis result for SHA-256 627c2879845969a9…

MALICIOUS

PDF

43.3 KB Created: 2020-08-13 02:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96098c065c561550bc450030686b6540 SHA-1: d004d7df73fec3bc7f9d2f709b87dc677d1b37ac SHA-256: 627c2879845969a94ed36576da73f9963495cc839a038804ea279ee4b7318b35
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent link, 'https://ttraff.cc/pify?keyword=dermatitis+atopik+bayi+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this same malicious URL, indicating an attempt to lure the user to a malicious site. The ML classifier also strongly indicated maliciousness.

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=dermatitis+atopik+bayi+pdf
    • http://files.nativenerds.org/uploads/1/3/1/4/131482822/fakoxaloje.pdf
    • http://files.northcountryhonorflight.org/uploads/1/3/1/4/131407247/9345291.pdf
    • http://soxixo.tipsywine.shop/uploads/1/3/1/6/131606490/d58f8f0a7f1852.pdf
    • http://files.communityfoundationoforange.org/uploads/1/3/1/4/131438423/nomavir.pdf
    • http://regaf.abundancecreativearts.com/uploads/1/3/0/7/130776779/f38dd5fdcde.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5827/4205/files/1892406894.pdf
    • https://cdn.shopify.com/s/files/1/0430/6056/0021/files/wedosidib.pdf
    • https://cdn.shopify.com/s/files/1/0438/2700/3549/files/pulaje.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/jusijulepesam.pdf
    • https://cdn.shopify.com/s/files/1/0432/5552/9640/files/numerical_solution_of_algebraic_riccati_equations.pdf
    • https://cdn.shopify.com/s/files/1/0437/5596/2522/files/10100655808.pdf
    • https://cdn.shopify.com/s/files/1/0434/4522/3581/files/zulufesu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8670/7876/files/small_business_plan_format.pdf
    • https://cdn.shopify.com/s/files/1/0436/6709/5705/files/loose_leaf_paper_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/8414/4037/files/16067709784.pdf
    • https://cdn.shopify.com/s/files/1/0434/3886/6593/files/69115548476.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a96.bin
b1518c9ce6430109ef2b07b3e56485cd294f702ef9ddfac1930d7a317d10f7a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A96 5460 bytes
font_01_sfnt_off00007d19.bin
4fb4674e1ab29724bf34b00c9f89ada968e7f358c2cd0ade42ff58de3dbfa654		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D19 10252 bytes

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