Malicious PDF — malware analysis report

Static analysis result for SHA-256 988463c3f800b37c…

MALICIOUS

PDF

40.3 KB Created: 2020-08-20 07:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0ed280d4ea0f9db1b266767aab9adc5 SHA-1: a759e4d611732078c3d9db42c1d1b464fa21cff3 SHA-256: 988463c3f800b37cc1c846030202b9b8783805b41c95b2a2fbf5f44ce129d4a4
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a prominent link that redirects to a known malicious URL, disguised as a resource for interview questions. This indicates a phishing or social engineering attack aimed at directing users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=self+introduction+interview+questions+and+answers+pdf
    • http://files.worlestonvillagehall.net/uploads/1/3/1/4/131483147/gusafomun.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/benubojebexoreloruva.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sibubemazalomasedexikeme.pdf
    • https://cdn.shopify.com/s/files/1/0429/6074/8695/files/dewinoreju.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/niriliruvurufuwupaku.pdf
    • https://cdn.shopify.com/s/files/1/0432/0811/4340/files/36039855678.pdf
    • https://cdn.shopify.com/s/files/1/0430/7078/3645/files/latemes.pdf
    • https://cdn.shopify.com/s/files/1/0436/1990/9794/files/rokodupazoranuketupuruje.pdf
    • https://cdn.shopify.com/s/files/1/0428/9023/1974/files/aide_android_java_ide_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/jedofemitegavuwes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0966/2366/files/pufimepidoxalopigi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4935/2349/files/21729375728.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/kilibakiroroge.pdf
    • https://cdn.shopify.com/s/files/1/0438/3775/1456/files/fusionner_document_en_ligne.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_off00005f98.bin
1a686ec43a1737f78667d8bb8c7dd1b8a0286481cec756eac49c03a86ceee521		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F98 5528 bytes
font_01_sfnt_off00007283.bin
34ece43ccf5cfe97534bb324360d09226f64ffed743fea6166b0dd03b0465124		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7283 9844 bytes

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