Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa521d1cb8edbf6…

MALICIOUS

PDF

39.3 KB Created: 2020-08-20 11:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd8e6bbfa4f02df93e886211a367342b SHA-1: 37c6fdf9788a5c35a9035d4cc5fabfd1831d6358 SHA-256: 5fa521d1cb8edbf643752753ac9c9a2315460ed528f7f4b1be8c641259d7902b
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating an attempt to lead users to harmful content. The document body, though partially corrupted, contains text related to a recipe and the malicious redirector URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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/pify?keyword=bbc+good+food+guide+strawberry+cheesecake
    • http://files.rescuetheunderdog.com/uploads/1/3/0/9/130969503/0bf4b172772989d.pdf
    • http://files.littlechiefsprimaryschool.com/uploads/1/3/0/8/130874055/9041001.pdf
    • http://files.blainevdg.com/uploads/1/3/2/7/132740665/fulajusomatamaxopiwe.pdf
    • http://gibikadax.izasfaceups.com/uploads/1/3/0/8/130814328/2954735.pdf
    • http://files.lslwinery.com/uploads/1/3/1/4/131407089/ebe11b7a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7507/5225/files/blouse_cutting_method_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0832/7829/files/ceda_business_plan_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/2947/9072/files/classes_of_antiarrhythmic_drugs.pdf
    • https://cdn.shopify.com/s/files/1/0431/0191/3244/files/98867803028.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/kenutolulepinawi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3456/5025/files/counselling_skills_for_health_professionals_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/0928/6050/files/wivogirawujisajuj.pdf
    • https://cdn.shopify.com/s/files/1/0435/4136/4890/files/61272272867.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80884551140.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_off00005b40.bin
664f046c4ba95e4810c40a59df2fd6b9abf8118f3a980ca781c5f65003778250
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B40 5700 bytes
font_01_sfnt_off00006eac.bin
e70484019fc65175414bb0fd2a9fe2f3a9143899e9ae1ced7bf5718f9ca48b93
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAC 9832 bytes