Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc734d52bfba31f…

MALICIOUS

PDF

49.6 KB Created: 2020-07-18 01:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: c66a8083447d2a832736399c8de2fffb SHA-1: 656ad18d5ec9f2b81184e724ce3cc6e74e7fb27e SHA-256: 0dc734d52bfba31f4a01d834d278ecf0857a53a3d1bdf5ad69f812e53e57586b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one critical heuristic firing indicating it redirects to known malicious infrastructure. The document body, though heavily obfuscated, appears to be a lure related to 'Jacob grimm teutonic mythology pdf' and was generated by wkhtmltopdf, suggesting a phishing or scam attempt. The presence of numerous links to external PDFs, many hosted on WordPress, further supports a link farm or SEO manipulation tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wb?keyword=jacob%20grimm%20teutonic%20mythology%20pdf In PDF document text
    • http://files.kmccreations.com.au/uploads/1/3/1/4/131453724/817ad733.pdfIn PDF document text
    • http://files.glencoeflorist.co.uk/uploads/1/3/1/8/131856276/nigijulozivedup.pdfIn PDF document text
    • http://files.markmirabello.com/uploads/1/3/1/6/131636772/buxafirulipusu.pdfIn PDF document text
    • http://files.versatile.pub/uploads/1/3/0/7/130775001/0e676d.pdfIn PDF document text
    • http://files.davisranchi.com/uploads/1/3/1/3/131380870/potipiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://megaxosu.files.wordpress.com/2020/06/wekavadavedagiz.pdfIn PDF document text
    • https://tamufewa.files.wordpress.com/2020/07/wutonujoba.pdfIn PDF document text
    • https://nuluxanetud669327104.files.wordpress.com/2020/07/41228547822.pdfIn PDF document text
    • https://mewalijovil.files.wordpress.com/2020/06/busevojirimesagomu.pdfIn PDF document text
    • https://vogupiboje.files.wordpress.com/2020/06/97221209829.pdfIn PDF document text
    • https://wetejog.files.wordpress.com/2020/07/21326896829.pdfIn PDF document text
    • https://lewarakorin.files.wordpress.com/2020/06/pubabizevesibojotu.pdfIn PDF document text
    • https://jikaxeludaja.files.wordpress.com/2020/07/lexolawozo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/78819802283.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4008/0021/files/wikoxejed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1218/5494/files/legugadivitupikogijibo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0935/1578/files/14463815547.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/33578183890.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/voduranujarunevulabinutu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9565/4554/files/66275391960.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32878299647.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5161/3336/files/konagopikazowune.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8234 5504 bytes
SHA-256: 97ae2981923385fd799062e1d2c74e52710af169401f2da91acb4cdb15791cb1
font_01_sfnt_off000094b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94B6 10904 bytes
SHA-256: 8cdc715a9a6a08a200a3e06b561f2c1ddbc05b134090b1c9507aa11f29b775bf