Malicious PDF — malware analysis report

Static analysis result for SHA-256 16bd9870e0325d43…

MALICIOUS

PDF

39.2 KB Created: 2020-09-01 01:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a439cd513a9b71b64c82f6ed45d890ab SHA-1: 61cbf412cec853857dfbc22382e6050582abc9f6 SHA-256: 16bd9870e0325d43d892317d72d34731e7ee484f5c99f1a700e5c1fe34f05403
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a primary malicious redirector URL. The document body, though heavily obfuscated, contains the malicious URL and text suggesting a lure for a 'vocabulary list definitions and sentences template'. The ML classifier strongly indicates maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the primary URL leads to harmful infrastructure.

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.cc/wix?keyword=vocabulary+list+definitions+and+sentences+template
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/2613/6743/files/clinical_medical_administrative_assistant_training_manual_template.pdf
    • https://cdn.shopify.com/s/files/1/0447/9169/3463/files/culture_of_animal_cells_ian_freshney.pdf
    • https://cdn.shopify.com/s/files/1/0429/9581/0455/files/sapesazamo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7916/3285/files/biboj.pdf
    • https://cdn.shopify.com/s/files/1/0429/8738/9087/files/gunuxopimiwi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5745/3985/files/comma_splice_activities.pdf
    • https://cdn.shopify.com/s/files/1/0428/8430/0959/files/similarity_and_congruence_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1326/files/52454363375.pdf
    • https://cdn.shopify.com/s/files/1/0431/1007/2481/files/duzosinavozujixom.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mufowotipopugisafe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90067119925.pdf
    • https://cdn.shopify.com/s/files/1/0428/3485/4051/files/sezumaderiwanuso.pdf
    • https://cdn.shopify.com/s/files/1/0437/8161/9861/files/26821582526.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d0d.bin
5edeeb6a6307c0f4b6cedd031d555310d24c2e445cda5486967d7aa7c08332f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D0D 5392 bytes
font_01_sfnt_off00005f3a.bin
dfb642dd01d0a634bd18c61f7b0ba3140b9e1fe9fe2437608eaad74801eb2848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3A 10052 bytes
font_02_sfnt_off00008194.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8194 4324 bytes

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