Malicious PDF — malware analysis report

Static analysis result for SHA-256 778ffcb6c16cf542…

MALICIOUS

PDF

38.6 KB Created: 2020-08-10 20:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 285c4b2e9a3f45ae9117fca82b9d8c02 SHA-1: aae399e832269a096c7faa4d86704f9de910b47f SHA-256: 778ffcb6c16cf542500bd6ffec851905f1b3f8da306d11ada7d4dd3f487db47d
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains associated with link farms and redirectors, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=punctuation+marks+quiz+pdf', which is flagged as a malicious redirector. This suggests the PDF is designed to trick users into clicking malicious links, likely for phishing or malware distribution.

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=punctuation+marks+quiz+pdf
    • http://files.releaseyourfullpotential.com/uploads/1/3/1/0/131069819/dujaxewum_zerevezo.pdf
    • http://nidobi.kpsm.net/uploads/1/3/0/8/130874359/673147.pdf
    • http://rewajo.southcoastdevelopment.com/uploads/1/3/1/4/131438079/83f89ce.pdf
    • http://files.mvhsmajorslibrary.com/uploads/1/3/1/4/131407877/4a2ac803983.pdf
    • http://files.waramaughospitalityco.com/uploads/1/3/1/3/131379477/filizoxij.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/palafasejuzanuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9673/files/jowugibulugileguri.pdf
    • https://cdn.shopify.com/s/files/1/0430/5725/0455/files/budget_allocation_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/kifutabipinusabu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0904/7717/files/53041318883.pdf
    • https://cdn.shopify.com/s/files/1/0437/1818/1013/files/75036367996.pdf
    • https://cdn.shopify.com/s/files/1/0436/7027/4201/files/alibaba_group_holding_limited_annual_report_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/4951/7205/files/tosaxakajolonojosemeniki.pdf
    • https://cdn.shopify.com/s/files/1/0430/2379/4337/files/22453576500.pdf
    • https://cdn.shopify.com/s/files/1/0433/2745/5382/files/vidufunoj.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/55897718606.pdf
    • https://cdn.shopify.com/s/files/1/0432/8534/8510/files/77388698465.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_off0000576b.bin
2c6128ee259c877d916b0be9c6f9cb837f584a28c200667e5ffc4d6027beb579		 pdf-font-stream PDF embedded font (sfnt) at offset 0x576B 5508 bytes
font_01_sfnt_off00006a0f.bin
72126f0ced2380bbe7187d8bad685af82d593f101e13cb79eea66cb7861291e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0F 10476 bytes

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