Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec98034c578fa96…

MALICIOUS

PDF

46.7 KB Created: 2020-08-18 18:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb8226721b99cbf66a0a3d48d3bee8e6 SHA-1: ef0feec3cd1084881fac3bbd5140f3418182e58a SHA-256: eec98034c578fa96845b2d185b45ffd9fa59026f70c7ee707e612c903cac046b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. The primary malicious URL identified is https://ttraff.cc/pify?keyword=expanded+form+worksheet+fourth+grade, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting the intent is to redirect the user to malicious content under the guise of an educational worksheet.

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/pify?keyword=expanded+form+worksheet+fourth+grade
    • http://miwadat.elvenelysium.com/uploads/1/3/2/8/132814930/6346711.pdf
    • http://niwatom.spiritualandparanormalconnections.com/uploads/1/3/2/7/132740541/6695746.pdf
    • http://rosobova.lavenderloftapothecary.com/uploads/1/3/1/0/131070152/3747055.pdf
    • http://files.beevoice.net/uploads/1/3/1/4/131437823/82f6640bb27899.pdf
    • http://wotodag.firstchristiancompton.org/uploads/1/3/2/8/132814097/nudoz_dibejakenodi_wuromugozig_kiforakoxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9604/7783/files/giwonutunimarib.pdf
    • https://cdn.shopify.com/s/files/1/0427/4782/2236/files/pivux.pdf
    • https://cdn.shopify.com/s/files/1/0432/8371/0108/files/spatial_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0431/1983/7346/files/37372905445.pdf
    • https://cdn.shopify.com/s/files/1/0433/6707/1894/files/gezuzujuzudoriwigupetutef.pdf
    • https://cdn.shopify.com/s/files/1/0438/9080/2856/files/gijofubosoriwamadalag.pdf
    • https://cdn.shopify.com/s/files/1/0428/7909/0855/files/laves.pdf
    • https://cdn.shopify.com/s/files/1/0438/8922/9979/files/15854950068.pdf
    • https://cdn.shopify.com/s/files/1/0431/8022/8759/files/sierra_bullets_reloading_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/8202/3061/files/disappointed_text_face.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c0a.bin
190ad087b1d59eba4e445557fa6c644fc6205228ac4da00c70b7b2717cc4d7a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C0A 5440 bytes
font_01_sfnt_off00007e77.bin
1f9bada560965b1dcd049a4c848027b15212d2e8ce26ff3a70f39e7bd588ea01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E77 9776 bytes
font_02_sfnt_off00009ff0.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FF0 4324 bytes

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