Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec52f2dcb115a9e0…

MALICIOUS

PDF

37.0 KB Created: 2020-07-12 20:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd2e81458a2a9101593b52b823d51235 SHA-1: 6a064fed043d54656f514fe1476a51fd6c639caf SHA-256: ec52f2dcb115a9e0886848c8e7715bd92016d564f1f405a06b04f516a8f20ab6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create documents for SEO spam or phishing lures. The presence of a malicious redirector URL points to a likely phishing or scam attempt.

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=upstream%20b2%20pdf
    • http://files.galenejackson.com/uploads/1/3/0/7/130740173/f4a1eb2320c405.pdf
    • http://files.detroitchamberorchestra.org/uploads/1/3/0/7/130775987/tisivegetud_magawesujir_jakisuzijimurur.pdf
    • http://files.mysoulsingsstudio.org/uploads/1/3/0/7/130739159/xovoda_jujanusegub_zuzelumitobaxop_nisov.pdf
    • https://pirotevo.files.wordpress.com/2020/06/gumolofida.pdf
    • https://fofukev.files.wordpress.com/2020/07/jasotewi.pdf
    • https://jimuzod.files.wordpress.com/2020/07/kamorasirigisapenuf.pdf
    • https://tufabasuzas.files.wordpress.com/2020/07/rukonovotutivupenifi.pdf
    • https://lusenexovaj.files.wordpress.com/2020/07/67473353490.pdf
    • https://kufexetironi.files.wordpress.com/2020/07/pobat.pdf
    • https://sogifefuve684083845.files.wordpress.com/2020/07/kudifo.pdf
    • https://nusovegot.files.wordpress.com/2020/06/kokomulusokito.pdf
    • https://janinulan.files.wordpress.com/2020/07/14794192713.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2469/files/75901457952.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/voxetevew.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6436/files/bololobaxuperekudil.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wetitoditasenubekuxon.pdf
    • https://cdn.shopify.com/s/files/1/0430/9454/0452/files/nuxazoxusipo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/3270510114.pdf
    • https://cdn.shopify.com/s/files/1/0429/0471/5427/files/59201829471.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/59210642714.pdf
    • https://cdn.shopify.com/s/files/1/0430/7058/7029/files/tufizedafonik.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_off000058b3.bin
f8647866393fc57a8c6c853d06b2016ab852910713ea53ab1a17332ac526a00a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58B3 4944 bytes
font_01_sfnt_off00006973.bin
a62c96111cc8f3efae73253cad55cd1b6ad5286b85a6a6cb5d6b9bf81ff50388		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6973 8640 bytes

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