Malicious PDF — malware analysis report

Static analysis result for SHA-256 53bcc70e73870161…

MALICIOUS

PDF

42.7 KB Created: 2020-08-11 20:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41ceff7aef9a412381b4d57ed82eda87 SHA-1: d79b8acd04569c9f833af638aa301e5e9d8f482b SHA-256: 53bcc70e7387016109a79cf675959f4096f7d8615115e0179c6f37baafc5f837
128 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=amar+bangla+boi+class+1+pdf+download'. The document body, though heavily obfuscated, also contains this URL and other links pointing to Shopify domains, likely part of a link farm designed to improve search engine rankings for malicious content. The presence of a download button lure further supports a malicious intent to trick users into downloading unwanted files.

Heuristics 4

  • 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.
  • 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
  • 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=amar+bangla+boi+class+1+pdf+download
    • http://files.inzei.tokyo/uploads/1/3/1/4/131407292/3984597.pdf
    • http://files.lgpotter.com/uploads/1/3/1/0/131071067/jetiravoja.pdf
    • http://files.ctmaple.org/uploads/1/3/0/7/130738701/9240813.pdf
    • http://files.jmhomeimprovements.co.uk/uploads/1/3/2/6/132695546/zetariv.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/poxifakobunasilune.pdf
    • https://cdn.shopify.com/s/files/1/0432/5769/2320/files/form_3903_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0432/9173/8277/files/gigawokunafaxefobiguwulix.pdf
    • https://cdn.shopify.com/s/files/1/0431/6531/9324/files/vogurejajej.pdf
    • https://cdn.shopify.com/s/files/1/0432/6991/4782/files/common_core_anchor_standards.pdf
    • https://cdn.shopify.com/s/files/1/0436/5962/4606/files/pastor_employment_contract.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/bufisabufuperirevo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2953/6676/files/carranza_clinical_periodontology_11th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0056/files/wild_magic_table_5e.pdf
    • https://cdn.shopify.com/s/files/1/0437/6412/1749/files/mijagaziwike.pdf
    • https://cdn.shopify.com/s/files/1/0431/2301/5836/files/rexigufadazevesoloridi.pdf
    • https://cdn.shopify.com/s/files/1/0436/1699/3440/files/46844066129.pdf
    • https://cdn.shopify.com/s/files/1/0428/2974/2246/files/42350458248.pdf
    • https://cdn.shopify.com/s/files/1/0431/4352/8609/files/46520598113.pdf
    • https://cdn.shopify.com/s/files/1/0435/7154/4225/files/international_auditing_standards_issued_by_intosai.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064a1.bin
73cf9ca77bfa996818c22f8d3e1f05347926c57aec5527f2542b13dc6abdf0cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A1 5748 bytes
font_01_sfnt_off0000781b.bin
0b570eec51cffc31aa7b52a5ad36835250e539c1b826e8486640b9f9c3925c64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x781B 10964 bytes

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