Malicious PDF — malware analysis report

Static analysis result for SHA-256 808453b0a12a0515…

MALICIOUS

PDF

51.5 KB Created: 2020-08-19 13:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78c8110d43549de4ea5e3df988c6b87b SHA-1: bc27b2b7fab6df8ef9367346bb9f46dfcfd3a746 SHA-256: 808453b0a12a0515c6669a43d9d3687e067ade5a87e4d3e8a2e75c33d69fead3
162 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain a lure related to 'logo quiz expert answers' and includes the malicious URL. The presence of numerous other links to Shopify PDFs suggests a link farm or SEO manipulation tactic to disguise the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=logo+quiz+expert+answers+level+1
    • http://wopebakip.constructionprogress.org/uploads/1/3/1/4/131407995/xafoxowag_pugukikabo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2901/2381/files/gentle_alarm_clock.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8179/files/biological_control_of_pest_and_diseases.pdf
    • https://cdn.shopify.com/s/files/1/0438/6832/4005/files/audix_om5.pdf
    • https://cdn.shopify.com/s/files/1/0431/8124/4573/files/muxowidubi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2677/6227/files/zoramarovun.pdf
    • https://cdn.shopify.com/s/files/1/0432/7545/2569/files/60814617333.pdf
    • https://cdn.shopify.com/s/files/1/0438/4397/7366/files/butusizagekaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/2042/7157/files/dps_meter_ffxiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/1724/8672/files/hedwig_s_theme_sheet_music_percussion.pdf
    • https://cdn.shopify.com/s/files/1/0432/9707/9460/files/lexuvi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/71389743076.pdf
    • https://cdn.shopify.com/s/files/1/0431/2095/1450/files/fizimisagidirojumokoza.pdf
    • https://cdn.shopify.com/s/files/1/0434/2831/5293/files/92173812576.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_off00008c5c.bin
4333f1924f3d8bef46450ef0200e341cac7916f014af29741ffe9642ec3830ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C5C 5376 bytes
font_01_sfnt_off00009ee5.bin
3403aa82625d3b800f9c99c1bc9b2a8aaa8eb7a864c2e5a368ece4685db0b2c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EE5 10132 bytes

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