Malicious PDF — malware analysis report

Static analysis result for SHA-256 69101ce2d919bf0e…

MALICIOUS

PDF

41.0 KB Created: 2020-08-04 05:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c767b6cbbd7e54081a90eafba8515b3e SHA-1: 628cdb5a81661e4d9d74c55836caa94cf5bf13a8 SHA-256: 69101ce2d919bf0e3a36e9f2967cfd40c0a57fd441a4e47c9c7da990fa967aa4
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed for SEO manipulation. One prominent URL, https://ttraff.cc/pify?keyword=oracle+11g+sql+developer+tutorial+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious infrastructure under the guise of a tutorial. The ML classifier strongly supports the malicious verdict.

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=oracle+11g+sql+developer+tutorial+pdf
    • http://files.rpgwoodworking.shop/uploads/1/3/0/8/130814246/notanorovipunul.pdf
    • http://files.eldertlc.org/uploads/1/3/2/6/132681969/9444273.pdf
    • http://files.jessikasmithmusic.com/uploads/1/3/2/6/132696063/8639423.pdf
    • http://files.sdrsp.org/uploads/1/3/0/7/130739719/9070579.pdf
    • http://files.intuitivereadings.com/uploads/1/3/0/7/130776054/3152086.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8136/7712/files/mosigelekate.pdf
    • https://cdn.shopify.com/s/files/1/0433/4275/8056/files/petazufubenebonuna.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7866/files/39420947024.pdf
    • https://cdn.shopify.com/s/files/1/0429/7372/4825/files/vemipenadekexomiwusuxub.pdf
    • https://cdn.shopify.com/s/files/1/0430/7386/3842/files/69254416143.pdf
    • https://cdn.shopify.com/s/files/1/0429/4790/3654/files/38551188772.pdf
    • https://cdn.shopify.com/s/files/1/0432/5241/6672/files/pdf_max_4.pdf
    • https://cdn.shopify.com/s/files/1/0429/5639/0551/files/negipebidaz.pdf
    • https://cdn.shopify.com/s/files/1/0435/7108/5475/files/effects_of_alcohol_during_pregnancy.pdf
    • https://cdn.shopify.com/s/files/1/0429/1608/5916/files/38359499218.pdf
    • https://cdn.shopify.com/s/files/1/0427/9658/1020/files/kopiziloxexuvudilenovegi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/zosevalizujipimuno.pdf
    • https://cdn.shopify.com/s/files/1/0432/8246/4928/files/89998341767.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_off00006050.bin
ed673f871360397c573bf808717a3d1aab11d37a945ade2b62cc8fc5bd4b0bc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6050 5588 bytes
font_01_sfnt_off00007364.bin
f66779325b3d1cbf3792400a4b6f29a9ffdcb49c2820fb83c2eeefb6056d1f96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7364 10376 bytes

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