Malicious PDF — malware analysis report

Static analysis result for SHA-256 628f5b349fad4ef1…

MALICIOUS

PDF

39.5 KB Created: 2020-08-24 05:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f991bab9e18f0a94ec077726a140a8b5 SHA-1: 27780743bc8bd8da6c0150c32a439146ded458f2 SHA-256: 628f5b349fad4ef1cdc0c820c5cea6621aa1168ee925c209c22bb916c6326a0e
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body and embedded URLs suggest a lure to bypass download limits, likely leading to a malicious payload. The presence of numerous external PDF links also indicates a link farm, a common tactic for SEO poisoning and traffic redirection.

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.
  • 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
  • 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.com/pify?keyword=bypass+mega++limit+mac
    • http://files.marquitalopez.com/uploads/1/3/1/3/131379434/nasuxolidure.pdf
    • http://files.christophercawley.us/uploads/1/3/2/6/132695546/buvitapovebarib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5584/8355/files/bacillus_licheniformis_infection.pdf
    • https://cdn.shopify.com/s/files/1/0428/6713/0534/files/maweviguposeruxekokidal.pdf
    • https://cdn.shopify.com/s/files/1/0434/7111/0310/files/14007926293.pdf
    • https://cdn.shopify.com/s/files/1/0430/8772/4704/files/pafolazuxidobozun.pdf
    • https://cdn.shopify.com/s/files/1/0432/3262/4797/files/65581672325.pdf
    • https://cdn.shopify.com/s/files/1/0430/5970/8058/files/xexarulawawijimoreb.pdf
    • https://cdn.shopify.com/s/files/1/0437/3345/0903/files/archaeology_magazine_download.pdf
    • https://cdn.shopify.com/s/files/1/0441/3066/4600/files/4782957548.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9959/files/3222498173.pdf
    • https://cdn.shopify.com/s/files/1/0436/0355/8564/files/how_to_run_bash_script.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_off00005d26.bin
97cb22e084f661019ba3dd6ce0eac3de071b8bee3670e62f1899b05ec7fb5875		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D26 5308 bytes
font_01_sfnt_off00006f29.bin
9cb5bb6feda0ce0d56e2a1b740e06bf114a14a0bba21007fcb5792602719ebb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F29 10048 bytes

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