Malicious PDF — malware analysis report

Static analysis result for SHA-256 18dd96aa68d58ba3…

MALICIOUS

PDF

40.5 KB Created: 2020-08-20 23:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0c8afeb0347681cf697d1f3b2dab146 SHA-1: 8e1f1afdf34b1762bd5236e4a996aa6253eea826 SHA-256: 18dd96aa68d58ba3ccd5405273451cdd0b55019812b1bf1b25af2bd510e6e513
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that matches the suspicious redirector, suggesting an attempt to trick users into downloading potentially harmful applications or visiting 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=always+on+display+apk+for+samsung+a20
    • http://fakigawiz.roam-beyond-home.com/uploads/1/3/2/8/132814500/takadunep_siwusof.pdf
    • http://files.ivfround.com/uploads/1/3/1/3/131382700/xipano_jiferirufelisej_jutoxagekipa.pdf
    • http://files.belongingcatholicconference4women.com/uploads/1/3/1/3/131382808/mulilevotoba.pdf
    • http://womutepuw.bcbpnyc.com/uploads/1/3/0/9/130969757/jadaxup_somosugejig_nesifiluledo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6258/1658/files/babulal_nagarmal_satnalika_foundation_scholarship_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/6428/7651/files/approaches_to_self_managed_learning.pdf
    • https://cdn.shopify.com/s/files/1/0427/4988/6620/files/pdf_to_word_converter_app.pdf
    • https://cdn.shopify.com/s/files/1/0435/4090/6143/files/die_monster_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0436/0939/1261/files/wijolivafom.pdf
    • https://cdn.shopify.com/s/files/1/0432/9078/7996/files/famubisaxifuguginido.pdf
    • https://cdn.shopify.com/s/files/1/0432/2128/7080/files/77924902124.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/63687818066.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5682/files/81170285593.pdf
    • https://cdn.shopify.com/s/files/1/0444/7895/5687/files/melimidawibav.pdf
    • https://cdn.shopify.com/s/files/1/0428/0470/7491/files/46984135582.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/duwan.pdf
    • https://cdn.shopify.com/s/files/1/0433/6123/9192/files/11038774933.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_off00005e02.bin
9abcfa059a4856df08c1f8e274122d204d66a7811dcef9798f9c8690f97459cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E02 5884 bytes
font_01_sfnt_off0000720f.bin
aaefed7e048461bcda2d2079ec1d566637874bfd0d873e7fffb12e536735ebb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x720F 10260 bytes

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