Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e2702663b0bc34…

MALICIOUS

PDF

56.5 KB Created: 2020-08-05 23:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11cb66a46c95ba6068315b69d81373f3 SHA-1: cea9260892946dad3926342dbcf8cdc2249ed6b1 SHA-256: 13e2702663b0bc344275b0f8b9347ce7fb077ce86594ad25091b9375c6a81efd
162 Risk Score

Malware Insights

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

The PDF contains a link farm with 30 external PDF links, many pointing to Shopify domains, and one critical link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=gate+agricultural+engineering+syllabus+pdf', suggesting a lure to download content. The presence of a visual download button further supports this phishing-like behavior.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=gate+agricultural+engineering+syllabus+pdf
    • http://files.cpathleticboosterclub.org/uploads/1/3/0/9/130969403/nirexudori.pdf
    • http://files.moonbearkungfu.com/uploads/1/3/0/8/130813799/d6346.pdf
    • http://files.libertytactical.solutions/uploads/1/3/2/6/132696104/vulisafudivisi.pdf
    • http://files.nestlingtrust.co.uk/uploads/1/3/0/8/130813135/xokodak_xisepeji_razeb.pdf
    • http://files.adamisbitsky.com/uploads/1/3/1/3/131380850/megogojavotiga_wezitumerovivad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2137/6410/files/mutasujerotifulu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6668/6617/files/14442652378.pdf
    • https://cdn.shopify.com/s/files/1/0434/0790/0835/files/87296525648.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0120/files/54390185212.pdf
    • https://cdn.shopify.com/s/files/1/0432/8439/8244/files/52405832462.pdf
    • https://cdn.shopify.com/s/files/1/0435/7485/3793/files/xirezutu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/math_308_tamu.pdf
    • https://cdn.shopify.com/s/files/1/0439/4765/5323/files/bemuvokofalu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6534/3133/files/43062192759.pdf
    • https://cdn.shopify.com/s/files/1/0427/4041/6678/files/kemejutififevajopipun.pdf
    • https://cdn.shopify.com/s/files/1/0429/5468/6620/files/18978204127.pdf
    • https://cdn.shopify.com/s/files/1/0433/5766/7487/files/vuzawapobapifaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/6473/7433/files/fipozazidagimelekego.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d99.bin
f87b8f0adc7d3781de0ad7f0da3411cb9488daedf9680d958fc99454dc985066		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D99 5596 bytes
font_01_sfnt_off000090b0.bin
5e067315a2bd9524b6254977960f062bb129990ed69868068e29b4596197f3c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90B0 2320 bytes
font_02_sfnt_off00009b03.bin
d861892776e92004f1685b62eae425e4e9ab323cc076077877c65cb2a0dc92ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B03 10272 bytes
font_03_sfnt_off0000be64.bin
a349519ccbdbca3d75704c2becf615ab37801eb1543272228454131dceb83acc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE64 16224 bytes

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