Malicious PDF — malware analysis report

Static analysis result for SHA-256 1757d6b9284625b1…

MALICIOUS

PDF

40.4 KB Created: 2020-08-20 20:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8294310bfa4c159e5cfb502510ae85ac SHA-1: 6723628d2952d56f56fb43f2791596e4b73b1206 SHA-256: 1757d6b9284625b1cce9082bdb10da6d1fdd85963aab7010ab5742d0d584e5e2
202 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of external PDF links, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains text related to 'Acrobat reader pdf pro' and a URL that appears to be a lure. The presence of a password archive lure heuristic further indicates an attempt to bypass security controls.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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
  • 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.ru/pify?keyword=acrobat+reader+pdf+pro
    • http://xumagipi.sandsfoleyentertainment.com/uploads/1/3/1/3/131378814/buxixave_wawulewefenak_xifigaraguna_xesulegilexoraf.pdf
    • http://files.bestcprseattle.com/uploads/1/3/2/3/132302859/4922287.pdf
    • http://files.tresasbridal.com/uploads/1/3/1/4/131482975/544560.pdf
    • http://files.theverticalfiles.com/uploads/1/3/1/3/131398547/fivemimefuv.pdf
    • http://weviw.englandlab.com/uploads/1/3/0/7/130738647/milazakojume_pikilenexoxil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3665/5259/files/amd-_action_downloadproduct_sp.pdf
    • https://cdn.shopify.com/s/files/1/0431/6381/2002/files/pabilogutakoxigup.pdf
    • https://cdn.shopify.com/s/files/1/0432/2256/5032/files/zaforijobegunosiletipokim.pdf
    • https://cdn.shopify.com/s/files/1/0432/1440/5793/files/personal_finance_tracker_template.pdf
    • https://cdn.shopify.com/s/files/1/0429/9885/7891/files/ssb4_legal_stages.pdf
    • https://cdn.shopify.com/s/files/1/0440/4533/6726/files/fufaxubakawugimabo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0743/4142/files/kemonafonekuvovif.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/73783850149.pdf
    • https://cdn.shopify.com/s/files/1/0452/1204/1367/files/17730810050.pdf
    • https://cdn.shopify.com/s/files/1/0432/2652/9956/files/barixekizunoloj.pdf
    • https://cdn.shopify.com/s/files/1/0437/8345/4871/files/31837639952.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006005.bin
9d4629a5314492b7a0ce44bc4ab3f9e214e266a8857dfbf03f6a4873878ab7dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6005 5068 bytes
font_01_sfnt_off00007146.bin
9c195340fc564c0ad2d4fdb21cede77ad952e9b1266725b40bdcd517c85a6dc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7146 10372 bytes

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