Malicious PDF — malware analysis report

Static analysis result for SHA-256 6066fea36fce16c8…

MALICIOUS

PDF

48.4 KB Created: 2020-07-31 03:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e1ff096b5b93e0cf989f4d2ac2651b2 SHA-1: 3613758b1bb52dff208531ae69d6d1aa98db7e0f SHA-256: 6066fea36fce16c8a048d1cfc8738935f176999f435f931d5bbd194a601684a5
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to a redirector service known for malicious activity. The document body and metadata appear to be obfuscated or corrupted, but the presence of numerous links to potentially malicious infrastructure strongly suggests an attempt to redirect the user to harmful content. 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.com/pify?keyword=tesis+sobre+el+aprendizaje+significativo+pdf
    • http://files.woodlandstuition.com/uploads/1/3/1/4/131438784/826502.pdf
    • http://files.wiekerutgers.com/uploads/1/3/0/7/130739570/b08a1b3.pdf
    • http://files.averagemeetsamazing.com/uploads/1/3/1/1/131164314/neziso.pdf
    • http://files.newstarwealth.com/uploads/1/3/2/3/132303081/fokusowiz_rugigifevilin_silomir_bukuwoxixeri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4790/2629/files/sedalapoxijes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9419/6902/files/45280708445.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/gijepevopititufabajuda.pdf
    • https://cdn.shopify.com/s/files/1/0431/5509/5716/files/xamoruwejo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3239/6447/files/81312438882.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wulusiwebope.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/filurobe.pdf
    • https://cdn.shopify.com/s/files/1/0428/1093/3414/files/27411687233.pdf
    • https://cdn.shopify.com/s/files/1/0432/5559/5172/files/76065952387.pdf
    • https://cdn.shopify.com/s/files/1/0435/6397/4805/files/76561883148.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/diguwubixu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1490/6275/files/pajifanugegazev.pdf
    • https://cdn.shopify.com/s/files/1/0434/3404/9703/files/72087961277.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://hdl.handle.net/10644/3786
    • 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_off00007b2b.bin
89e32b60d1deaff5d09f42b328684fdfc9f054be87edd2605650ba6d0ce8a5ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B2B 5384 bytes
font_01_sfnt_off00008d99.bin
89c285f81d68c3cf1ab6b1facbdf707e5a8979beb2e61c2b3c222e6e8077153f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D99 11136 bytes

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