Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40ec9c85101e7b1…

MALICIOUS

PDF

123.1 KB Created: 2020-08-12 17:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fe3db30a892c07fd49d18453496cc15 SHA-1: 102cdee81d990c37c5c6010d53ee923de69251b3 SHA-256: b40ec9c85101e7b14157b1f292854e9631986e35c813c3794732bbde68837b71
152 Risk Score

Malware Insights

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

The PDF contains a prominent link to 'ttraff.ru', identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and references 'El amante liberal pdf', suggesting a lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or redirection attempt.

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=el+amante+liberal+pdf
    • http://files.handandgear.com/uploads/1/3/0/8/130874110/kijaninuwazira.pdf
    • http://files.torontopilipinosdachurch.org/uploads/1/3/1/8/131856205/razet-visavafa.pdf
    • http://files.illuminatedsabers.com/uploads/1/3/1/4/131438459/c7353.pdf
    • http://files.kercon.ie/uploads/1/3/1/3/131382470/5412917.pdf
    • http://files.drewbufalini.com/uploads/1/3/1/8/131871633/e5038f1cd631.pdf
    • https://cdn.shopify.com/s/files/1/0440/5598/6326/files/fubufosovototobobutumot.pdf
    • https://cdn.shopify.com/s/files/1/0434/1635/4977/files/dudivavivutifelileza.pdf
    • https://cdn.shopify.com/s/files/1/0432/8777/3342/files/oceanography_notes.pdf
    • https://cdn.shopify.com/s/files/1/0429/5213/0716/files/kirolikimujejek.pdf
    • https://cdn.shopify.com/s/files/1/0432/4104/6171/files/anabas_testudineus.pdf
    • https://cdn.shopify.com/s/files/1/0434/8225/1426/files/wujavugurat.pdf
    • https://cdn.shopify.com/s/files/1/0446/0825/8211/files/report_cards_hillsborough_county.pdf
    • https://cdn.shopify.com/s/files/1/0438/5590/4918/files/minikapewotozagosivobuva.pdf
    • https://cdn.shopify.com/s/files/1/0430/4306/1909/files/40411218301.pdf
    • https://cdn.shopify.com/s/files/1/0434/1887/8117/files/14731109245.pdf
    • https://cdn.shopify.com/s/files/1/0435/1416/7450/files/psp_games_list.pdf
    • https://cdn.shopify.com/s/files/1/0440/1460/0342/files/.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a8d8.bin
72a248a15ed02a2331a769fa82ab52f0a872f8b601b0e3c76129934cd8ff836f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8D8 5108 bytes
font_01_sfnt_off0001ba18.bin
127fca21a8f5ee835d08d7fa22e0c3abefff57dcb80be54687c7a68e1d584bf8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA18 11272 bytes