Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ca884329951c7c…

MALICIOUS

PDF

46.5 KB Created: 2020-08-19 10:40:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17afffb157a84ff25aeb6e5149259147 SHA-1: 50df28830008f06e4861369df7db8ce3956d944a SHA-256: f1ca884329951c7cc6d6ff18e377ed2d986590128c679ca59b29e5333e9b6841
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, disguised as a size guide. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms this. Additionally, the PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, suggesting a link farm for SEO manipulation or traffic redirection. The ML_NYX_PDF_MALICIOUS heuristic strongly supports the malicious classification. The document body contains obfuscated text and the malicious URL, further reinforcing the attack pattern.

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.ru/pify?keyword=american+eagle+womens+jeans+size+guide
    • http://files.onpointsharp.com/uploads/1/3/1/0/131070151/faxasugamu.pdf
    • http://files.govindaincense.com/uploads/1/3/1/4/131437225/3863948.pdf
    • http://zokanisu.tingsrydsbrukshundklubb.com/uploads/1/3/0/8/130814017/6508082.pdf
    • https://cdn.shopify.com/s/files/1/0432/9956/9829/files/modalidades_del_genero_dramatico.pdf
    • https://cdn.shopify.com/s/files/1/0434/1766/5703/files/xomufunazu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4667/4330/files/anesthesia_made_easy_jeff_steiner_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/6851/2669/files/navy_asvab_study_guide_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/4186/5384/files/subtraction_with_regrouping_worksheets_for_grade_3.pdf
    • https://cdn.shopify.com/s/files/1/0431/1918/1978/files/budgeting_worksheets_for_adults_uk.pdf
    • https://cdn.shopify.com/s/files/1/0428/2325/4179/files/building_construction_materials_list.pdf
    • https://cdn.shopify.com/s/files/1/0434/7409/2196/files/farikukusoxekuji.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/behaviourism_school_of_thought.pdf
    • https://cdn.shopify.com/s/files/1/0431/1551/1964/files/botobapetakotiven.pdf
    • https://cdn.shopify.com/s/files/1/0433/8545/4757/files/66464667119.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006689.bin
318e724911ef73a0cf381e9d549e1d9c7398583dbcdac9038ff8f7bb9ef3d258		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6689 5268 bytes
font_01_sfnt_off00007859.bin
24e562957ace77720255039224f54594ab60a6378d54c8005eee25baf1728fe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7859 11940 bytes
font_02_sfnt_off00009ee1.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EE1 4324 bytes

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