Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dbcab70ab945000…

MALICIOUS

PDF

37.5 KB Created: 2020-08-12 23:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0692fb7f3311bd8cabb1cba3722d1f0 SHA-1: 01b0be31f16265f791db1769d54b65381d1f2736 SHA-256: 0dbcab70ab9450008037470d7b5c7499267d97b4a119fe30768109f34f608dec
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one identified as a malicious redirector. The document body, though partially obfuscated, includes text related to 'curriculum design' and a URL that appears to be a lure. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector suggests an attempt to lead the user to a compromised or malicious site, likely for further exploitation or credential harvesting.

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=curriculum+design+volume+1+pdf
    • http://xitakabu.registry20.org/uploads/1/3/1/4/131410007/lidikab_mofaja_ninexibuvifani.pdf
    • http://files.ikargb.co.uk/uploads/1/3/1/4/131409170/c416f2d8c877.pdf
    • http://nugowi.ovingpc.com/uploads/1/3/0/7/130739835/2d62f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://cdn.shopify.com/s/files/1/0433/5039/2984/files/lejajokimu.pdf
    • https://cdn.shopify.com/s/files/1/0439/3231/9912/files/rti_amendment_bill_2020_upsc.pdf
    • https://cdn.shopify.com/s/files/1/0430/1458/6517/files/astral_projection_complete_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/7369/1045/files/kenmore_sewing_machine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/7796/7778/files/kirofufitanofoweke.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2856/files/92491007186.pdf
    • https://cdn.shopify.com/s/files/1/0434/0622/9654/files/visodavasuki.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/xutuvezin.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/ccrt_for_upsc.pdf
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/mysql_command_line_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/2962/6017/files/vosumeva.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://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000045ae.bin
5377d91275a7e3198ec7644f1f3d2fa1bebd0628ed238fe12096a0d27c5fba82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45AE 5284 bytes
font_01_sfnt_off00005790.bin
d8e4b7f44dfb66ea49c7f1cefd345a391fade3fb548cc17de4cdbf151663dabd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5790 6068 bytes
font_02_sfnt_off00006740.bin
3c79535e26a7244447e8c945dad68b3929d2aa5e3e067667f75f55559dfb9ad3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6740 9884 bytes

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