Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b2a3c16fafb8181…

MALICIOUS

PDF

42.4 KB Created: 2020-07-09 14:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17b9a66860d097ec7cb0037f55e11661 SHA-1: d36a931bd8ad568b71fa51b93f1fd3c1111c4a13 SHA-256: 7b2a3c16fafb81813e8e1ab905e94367ef134160e9e95a88104193bafbcbc8a5
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one that redirects to malicious infrastructure. The document body text, though partially corrupted, suggests a lure for downloading a resume format. The presence of a malicious redirector and a link farm indicates a phishing or scam attempt. No scripts were extracted from this sample.

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/wb?keyword=resume%20format%20download%20pdf
    • http://files.ticsndt.com/uploads/1/3/1/8/131856176/rerosot.pdf
    • http://files.cninc.org/uploads/1/3/2/7/132740479/5324237.pdf
    • http://files.plussizeweddingdressesinmassachusetts.com/uploads/1/3/0/8/130814007/2853417.pdf
    • http://files.odditieseclub.com/uploads/1/3/2/6/132695881/rapis.pdf
    • http://files.andreapulido.com/uploads/1/3/1/4/131452989/8957b0437.pdf
    • http://files.adhesivetreats.shop/uploads/1/3/2/6/132696263/e18b86e.pdf
    • http://files.baltimorespa.net/uploads/1/3/0/7/130775940/9806876.pdf
    • http://files.freshrescue.com/uploads/1/3/1/3/131398357/2325814.pdf
    • http://files.patriciagodden.com/uploads/1/3/1/4/131483019/5adf2.pdf
    • http://files.riverbendins.com/uploads/1/3/1/8/131856071/nenixebamiv-voxijelazulupo-xikalibugezim-rakuletoligixiw.pdf
    • http://files.maggieshine.com/uploads/1/3/1/4/131452778/8b212eb4.pdf
    • http://files.openstarmaths.org/uploads/1/3/1/6/131637919/98fc8f5e.pdf
    • https://puneruxa.files.wordpress.com/2020/07/jajugoxapisurosavu.pdf
    • https://lorelezinilu.files.wordpress.com/2020/06/25872522271.pdf
    • https://polulexugiz.files.wordpress.com/2020/06/19974248951.pdf
    • https://zelojusonim.files.wordpress.com/2020/06/davoxoj.pdf
    • https://gedudupirig.files.wordpress.com/2020/07/469618680.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovetutokukike.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91960476686.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bijuwosozawubuvenokuzi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99237037604.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_off000069eb.bin
42457bcdc70d3cb44487d0f0b4de576bac7c6ff5f7167c08e5d7d786aaa46b94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69EB 5120 bytes
font_01_sfnt_off00007b4b.bin
61b856ef5ab9d3db165693a0f791427cb11df3fdabb2c5e4e541fdbac042c17a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4B 9700 bytes

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