Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cdaee16bb43fa13…

MALICIOUS

PDF

40.5 KB Created: 2020-08-22 03:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83c63d01b603ea6b30a408f249cdced6 SHA-1: b90bf61fee5008490872755bffeb890985798207 SHA-256: 6cdaee16bb43fa134b6503fa07207344278721c09053469efcc14f0b334dbd61
202 Risk Score

Malware Insights

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

The PDF contains a link to a redirector (`ttraff.cc`) that is flagged as malicious, suggesting a phishing or malware distribution attempt. The document body and embedded links also point to a large number of external PDFs, many hosted on Shopify, which is characteristic of SEO link farm abuse. The presence of a 'download button' lure and password archive lure further supports a malicious intent to trick the user into downloading a payload.

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.cc/pify?keyword=camscanner+free++for+mobile
    • http://files.alberthistoricdocuments.com/uploads/1/3/0/7/130740148/nefetavol_vasonakekevafu_bajukup_sarexitiwafum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8802/7555/files/leessang_lyrics_you_are_the_answer.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2695/files/farabinalet.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1513/files/16219395037.pdf
    • https://cdn.shopify.com/s/files/1/0434/0652/4566/files/36727895719.pdf
    • https://cdn.shopify.com/s/files/1/0434/8923/1000/files/2264769432.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/php_ini_wordpress.pdf
    • https://cdn.shopify.com/s/files/1/0432/2476/0484/files/zenivokevukivetizobo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/how_to_convert_radians_to_degrees.pdf
    • https://cdn.shopify.com/s/files/1/0429/7284/0090/files/aicpa_audit_guide_audit_sampling.pdf
    • https://cdn.shopify.com/s/files/1/0428/3059/4204/files/weruwukikefifiriveroxaf.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_off00005d9d.bin
d9387ce8acd64bb6786510074f7af15dd1bfe083dfd3f7a4b3af50e220c192f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D9D 5072 bytes
font_01_sfnt_off00006ec1.bin
8803edc5bb1efde0fde877f53c2abb9c2da0aee5907848e0d7d48f20a315fbc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC1 11620 bytes

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