Malicious PDF — malware analysis report

Static analysis result for SHA-256 122970469d4cfa9a…

MALICIOUS

PDF

43.6 KB Created: 2020-08-10 06:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 629e294fb541e0afd651860c01ded293 SHA-1: eefce50ad549383cbc885c1894ba7bae5a1038fb SHA-256: 122970469d4cfa9aa6f4da19a775ab8caa994180a9f15044e4e0e4397248faee
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains this malicious URL. This suggests the primary purpose is to lure users to malicious sites, likely for further exploitation or phishing. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent.

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=externalidades+economia+ambiental+pdf
    • http://kafizaw.ssls-eg.com/uploads/1/3/1/6/131606490/5239616.pdf
    • http://files.kitchenvt.com/uploads/1/3/0/9/130969708/bekum_kujebodadejaxe.pdf
    • http://files.audiocognoscenti.com/uploads/1/3/2/7/132740547/4534660.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34888362351.pdf
    • https://cdn.shopify.com/s/files/1/0432/2423/6199/files/momopufobojep.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3089/files/risk_assessment_methods.pdf
    • https://cdn.shopify.com/s/files/1/0433/4524/8407/files/convert_file_to_word_doc_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/denedomazakubunepuvawozen.pdf
    • https://cdn.shopify.com/s/files/1/0432/0460/8155/files/59212590831.pdf
    • https://cdn.shopify.com/s/files/1/0428/8456/3110/files/trek_4500_mountain_bike.pdf
    • https://cdn.shopify.com/s/files/1/0433/3623/7206/files/23470174668.pdf
    • https://cdn.shopify.com/s/files/1/0436/0699/9203/files/88420440369.pdf
    • https://cdn.shopify.com/s/files/1/0431/8652/0224/files/40130060101.pdf
    • https://cdn.shopify.com/s/files/1/0431/0781/1482/files/23301481323.pdf
    • https://cdn.shopify.com/s/files/1/0431/1616/7319/files/articulacion_alveolo_dental.pdf
    • https://cdn.shopify.com/s/files/1/0432/7977/7952/files/pagifa.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_off000068ce.bin
caa40a517b008a48419e409f12ce6619c5bcb513179424f1c824b11df3113b75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68CE 5464 bytes
font_01_sfnt_off00007b50.bin
a315bdc6e2a423333955dc9fcf4dcf058463bc0b138124fe4364db87a54b01af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B50 11128 bytes

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