Malicious PDF — malware analysis report

Static analysis result for SHA-256 7554583aec36e212…

MALICIOUS

PDF

46.5 KB Created: 2020-08-16 18:40:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02644ca5f7009797db33b650645cfbd2 SHA-1: cb36d0c07d42f7bdf18ff4745e3003e2864b2553 SHA-256: 7554583aec36e212552670251c27f121936237948a3ca965aade869217af0c45
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links, including one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting users to potentially harmful websites, likely for phishing or malware distribution. The presence of many external PDF links suggests a link farm or SEO manipulation tactic.

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=gastrointestinal+tuberculosis+pdf
    • http://files.optimisticliving.com/uploads/1/3/1/4/131453106/jibejekupemaburofi.pdf
    • http://files.allergysupportcentre.org/uploads/1/3/1/0/131070934/3d82a087ee.pdf
    • http://files.istmstyles.com/uploads/1/3/1/3/131398036/34ccb4e5e73.pdf
    • http://gidigo.mx.danielreinhart.com/uploads/1/3/0/7/130776428/xuzuvonezagusiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0522/2818/files/95862637613.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3032/files/12894884620.pdf
    • https://cdn.shopify.com/s/files/1/0435/7075/7791/files/35793103793.pdf
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/muscle_hypertrophy_workout.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/35022180152.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/voreziwomekugefujax.pdf
    • https://cdn.shopify.com/s/files/1/0447/1944/0028/files/boston_harborwalk_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/0381/3781/files/menatisikunabizezi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1969/7308/files/agni_siragugal_tamil_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6278/8245/files/86950584379.pdf
    • https://cdn.shopify.com/s/files/1/0435/9975/7474/files/2679118485.pdf
    • https://cdn.shopify.com/s/files/1/0438/7930/1288/files/writing_polynomials_in_standard_form.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_off00007670.bin
3d322a6870d221802acb62e2f3ee7ded04aa47c116fefadab9292bfc10eb013b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7670 5320 bytes
font_01_sfnt_off00008890.bin
dfe5894ac47340307dd3a8b0dad59d13b65672283215287333f2b8cdacf7ff4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8890 10700 bytes

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