Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a885f432bac1e81…

MALICIOUS

PDF

53.9 KB Created: 2020-08-27 17:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c3522ca0bbaf7b8d2cbd529f08e57e8 SHA-1: 4dca425fbbbeb299280e7fdb1d89678914dbb935 SHA-256: 7a885f432bac1e81497540558548327af66ac0cf9cd6d8ee4901956699d53b4d
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, which is further supported by the 'Password-protected archive handoff' heuristic. The document body, though heavily obfuscated, contains a URL that appears to be the target of the lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a potentially harmful archive.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.ru/pify?keyword=programa+para+abrir+rar+archivos+par
    • http://bebinoriz.thelongwellfiles.com/uploads/1/3/1/3/131397997/c1cfee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8237/4561/files/77538967307.pdf
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/fomogezolategisuluxezafef.pdf
    • https://cdn.shopify.com/s/files/1/0429/5199/9637/files/24239599626.pdf
    • https://cdn.shopify.com/s/files/1/0435/6017/3717/files/reragure.pdf
    • https://cdn.shopify.com/s/files/1/0433/5481/6667/files/standard_ps_2_keyboard_driver_hp.pdf
    • https://cdn.shopify.com/s/files/1/0440/1378/1157/files/free_printable_sheet_music_paper.pdf
    • https://cdn.shopify.com/s/files/1/0430/1167/0179/files/rovetukono.pdf
    • https://cdn.shopify.com/s/files/1/0432/2046/7869/files/gumonigusimorujofosa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6825/2565/files/free_alphabetical_order_worksheets.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • 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_off000068da.bin
01ac34376b7092400a12f9c5b46029046d686b565a1181b560d79e3eb0283013		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68DA 6832 bytes
font_01_sfnt_off00007a2a.bin
9d90134aed9f965eeb68046dc0c2524b58f90513488a164d28a50ebba2521bba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A2A 5516 bytes
font_02_sfnt_off00008ccc.bin
19c981225f9fff5311e61987e4b107e188c1af4f0bc71a504634c069dc7e9ddc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CCC 11512 bytes
font_03_sfnt_off0000b279.bin
bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB279 16312 bytes

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