Malicious PDF — malware analysis report

Static analysis result for SHA-256 02ecf88d1e59ce62…

MALICIOUS

PDF

43.2 KB Created: 2020-08-09 22:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a9d77f6d41297629ea9df86005c6ace SHA-1: 3a37a4c1f8b324fa4231a6452e03382ec1d4015c SHA-256: 02ecf88d1e59ce62bfa64537e01606fe44f71ed852c473faaeb97e8c4f039548
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a deceptive title related to alcohol and drug abuse, but its primary function is to host a large number of external links, including a known malicious redirector. This suggests a link-farming or phishing attempt to direct users to malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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=causes+of+alcohol+and+drug+abuse+pdf
    • http://files.silviabattista.com/uploads/1/3/0/7/130776088/jotunodeluke-sodunijira-vuxulukuxit-lowofefo.pdf
    • http://files.tammybiggsgymnastics.com/uploads/1/3/1/4/131437107/9859267.pdf
    • http://files.makeyourownlipstick.com/uploads/1/3/1/3/131384098/ritexosigizuzasewif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6599/8501/files/free_kick_abcya.pdf
    • https://cdn.shopify.com/s/files/1/0447/3890/4218/files/liver_cirrhosis_treatment_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54440827626.pdf
    • https://cdn.shopify.com/s/files/1/0437/2358/7733/files/pisoxolufov.pdf
    • https://cdn.shopify.com/s/files/1/0432/2027/1259/files/tapioca_processing.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5352/files/53755850372.pdf
    • https://cdn.shopify.com/s/files/1/0431/3032/3095/files/senebunulexorolowolub.pdf
    • https://cdn.shopify.com/s/files/1/0437/9292/4821/files/job_application_writing.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8996/files/32595181437.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3464/files/56164489954.pdf
    • https://cdn.shopify.com/s/files/1/0433/4416/7064/files/sapas.pdf
    • https://cdn.shopify.com/s/files/1/0430/0288/8351/files/goluwolapimemelife.pdf
    • https://cdn.shopify.com/s/files/1/0432/6785/0390/files/jeriz.pdf
    • https://cdn.shopify.com/s/files/1/0436/4166/7734/files/nestle_aptitude_test_past_questions.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/vudifexanugoxirova.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_off00006909.bin
70069b8c9bc57bd0d42469f9dfb75bee32169ead922af3fb2bf96ebcbea803e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6909 5464 bytes
font_01_sfnt_off00007b8b.bin
0150805c1af1dd230a8027b93e85774d70dbaac2eb46456021c2e7d7aad0f82e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B8B 10604 bytes

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