Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b84e82489946a43…

MALICIOUS

PDF

46.9 KB Created: 2020-07-17 03:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d113edde52cf5264636877cfd6abf85 SHA-1: 161dc233ee43ca3f62a64b8757e0d85f9b17ca0d SHA-256: 7b84e82489946a43f1b492caab2603b9bb7045db6bcd87c8c3c1b57a309fba43
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM' and another flagging a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of links suggests an attempt to lure users to potentially malicious sites, possibly for phishing or to download further malware.

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=runagate%20runagate%20pdf
    • http://files.watersportsinkorea.com/uploads/1/3/0/7/130776167/db9509707c7.pdf
    • http://files.freespiritplaysandmusicals.com/uploads/1/3/1/4/131405951/8812517.pdf
    • http://files.nenadmarkovic.net/uploads/1/3/2/7/132712116/38fabc673b.pdf
    • http://files.mikefraserphotography.co.uk/uploads/1/3/1/8/131857920/2b2a9b60c21347c.pdf
    • http://files.minilivestock.com/uploads/1/3/2/7/132740415/38a223c.pdf
    • http://files.grundmeyerleadersearch.com/uploads/1/3/1/4/131455956/puziwoxem.pdf
    • http://files.icombatbristol.co.uk/uploads/1/3/1/4/131437680/goguro_xupagedibilawe_tijapuzusupe_xagejij.pdf
    • http://files.daffodilacres.com/uploads/1/3/1/0/131070498/kanez_mabevovaboj_jinipe_jodokupozutad.pdf
    • http://files.loopersound.com/uploads/1/3/1/3/131378953/puwogofasisubali.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://filabikug.files.wordpress.com/2020/07/51996582335.pdf
    • https://nigosuwotobe.files.wordpress.com/2020/07/81527450701.pdf
    • https://latavewudewe.files.wordpress.com/2020/07/pukifitaxaga.pdf
    • https://sinufeg.files.wordpress.com/2020/07/kewide.pdf
    • https://liminuruwun.files.wordpress.com/2020/07/31832309365.pdf
    • https://cdn.shopify.com/s/files/1/0428/1221/1359/files/61598893644.pdf
    • https://cdn.shopify.com/s/files/1/0431/2462/1473/files/95842458089.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7312/files/fufokakagu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7165/2508/files/mudakav.pdf
    • https://cdn.shopify.com/s/files/1/0429/0582/9532/files/39855957315.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/11643955949.pdf
    • https://cdn.shopify.com/s/files/1/0433/4505/1797/files/lemud.pdf
    • https://cdn.shopify.com/s/files/1/0437/6985/6158/files/takajibewozemup.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_off000077a4.bin
4d5b7f89c0abb621b84bf9255f572617c95e976634192ce76764f7b984d376fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77A4 4728 bytes
font_01_sfnt_off000087bc.bin
24163a993f4cdf4efc2ee0d2f9bc5ba1e31ccae4a90dac8934781e941eadc4c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87BC 10920 bytes

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