Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3bc2bce3247acb4…

MALICIOUS

PDF

44.6 KB Created: 2020-08-21 03:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f51bf831ed88f08796cec6435496a0b SHA-1: 7fb929af87b0b598b8f66a6a8d2e32064b1fd7a0 SHA-256: d3bc2bce3247acb4f959277dbd0306e2f7d55aec25f262e3cd4110bdd6fdc5e6
120 Risk Score

Malware Insights

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

The PDF document was identified as malicious due to its extensive use of embedded links, forming a link farm. One critical heuristic firing indicates a direct link to a known malicious redirector at 'https://ttraff.com/pify?keyword=best+free+pdf+app+windows+10'. The document body contains garbled text but also includes the same redirector URL, suggesting it's the primary lure. The presence of numerous other links, many pointing to Shopify domains hosting PDF files, indicates a coordinated effort to distribute malicious content or phish users.

Heuristics 3

  • 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.
  • 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=best+free+pdf+app+windows+10
    • http://files.treegirl.org/uploads/1/3/1/6/131637218/zijuvemifuri.pdf
    • http://files.eastviewregina.com/uploads/1/3/0/7/130738719/nirobuz.pdf
    • https://cdn.shopify.com/s/files/1/0456/8252/4319/files/nazixudopewugu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7307/7409/files/31234635349.pdf
    • https://cdn.shopify.com/s/files/1/0429/5675/1002/files/39169025868.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luvibuxunefipefijuli.pdf
    • https://cdn.shopify.com/s/files/1/0435/8845/2515/files/juwavafi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1887/1207/files/10th_new_syllabus_social_science_volume_2_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/4016/9366/files/bloons_td_6_update_apk.pdf
    • https://cdn.shopify.com/s/files/1/0434/2631/6455/files/vi_show_line_numbers.pdf
    • https://cdn.shopify.com/s/files/1/0428/6555/7671/files/batman_arkham_knight_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/batimebirenotowevi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xifadek.pdf
    • https://cdn.shopify.com/s/files/1/0429/5901/2006/files/wuxet.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_off00007025.bin
1252ba2f946627d520344f50f186d33652237fb68c3832f8d61133d76c12b6cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7025 5336 bytes
font_01_sfnt_off00008270.bin
eb239a497718dedfe5dedc0149da3d3980c1370b6547bde320984675343f5f39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8270 10376 bytes

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