Malicious PDF — malware analysis report

Static analysis result for SHA-256 eabd165301ed5e9e…

MALICIOUS

PDF

45.1 KB Created: 2020-09-11 08:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 385fe7277d8ed0316282d38c48a845e1 SHA-1: fcd8e96b5cf68eb9a0e7b6371ad6dacb1e62731d SHA-256: eabd165301ed5e9ea64df9ad699f6e747b9b5b31daf6fca22fe58b9551faa9e3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to an online admission form and the malicious URL. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be a social engineering lure to trick users into visiting a malicious URL.

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.me/pify?keyword=cust+online+admission+form
    • http://jalinasa.wcreekoh.com/uploads/1/3/1/1/131164250/kakusiwujabexu_tadudotage_nogewete_remed.pdf
    • http://barij.wallyplastics.com/uploads/1/3/1/4/131407227/3fe0e400.pdf
    • https://static.usrfiles.com/ugd/4ae4db_dc510a8225354b5c8fd98ad080b3e9e4.pdf
    • https://static.usrfiles.com/ugd/930050_1aca171093a6487995a15f77fd309a61.pdf
    • https://static.usrfiles.com/ugd/73cb9e_8cb6248020364069a7e1e1056e31b713.pdf
    • https://static.usrfiles.com/ugd/4d400c_09a6e16fb85d4a0c89e3d23699526674.pdf
    • https://static.usrfiles.com/ugd/87d215_4d5a45e012974f32923976e4d84b53ef.pdf
    • https://static.usrfiles.com/ugd/bb10c5_ab368e0e33384319ab25ec43146bdcfe.pdf
    • https://static.usrfiles.com/ugd/b56239_6de6f488d0e34e41b7c4a007b935724c.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_off0000656d.bin
c3906981993f7f13918e314a1f43eec9cc85b94404699f0187679ac1cb6e4cdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x656D 4960 bytes
font_01_sfnt_off00007630.bin
2d63922f7e66d341e33a44a030154cb96a3811c793559d69722a4aac8d87cb68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7630 10404 bytes
font_02_sfnt_off000099c1.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99C1 4324 bytes

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