Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d5783d4cbfa6e6…

MALICIOUS

PDF

38.1 KB Created: 2020-08-31 21:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8fce85bad512b8d9d24e83f2b864d721 SHA-1: 7e956699d8c49af12d352411c18d015c35fdb74c SHA-256: b1d5783d4cbfa6e6220805e77b5c1771cf91e49a73cd1e60a92cbdc97b2dec65
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=bakers+delight+scone+nutritional+information'. Additionally, another critical heuristic indicates a PDF link farm, with numerous external PDF links, the first of which is 'https://cdn.shopify.com/s/files/1/0432/2413/7890/files/73895305932.pdf'. The document body, though heavily obfuscated, contains text related to 'Bakers delight scone nutritional information' and the URL, suggesting a lure to disguise the malicious intent. The primary attack pattern involves redirecting users to potentially harmful websites.

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.ru/wix?keyword=bakers+delight+scone+nutritional+information
    • https://cdn.shopify.com/s/files/1/0432/2413/7890/files/73895305932.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/files/zudaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/6956/2266/files/sobipawok.pdf
    • https://cdn.shopify.com/s/files/1/0439/5221/0088/files/prifix_born_and_raised_album.pdf
    • https://cdn.shopify.com/s/files/1/0433/4095/5803/files/how_to_draw_bending_moment_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/metuxolepuzur.pdf
    • https://cdn.shopify.com/s/files/1/0438/1330/6530/files/bundelkhand_university_admission_form_2019.pdf
    • https://cdn.shopify.com/s/files/1/0431/5581/6608/files/14925545017.pdf
    • https://static.usrfiles.com/ugd/e8506d_b5c40414e4b145549c25f44465291f19.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e202a750dc94e2f835ba47a38de55a2.pdf
    • https://cdn.shopify.com/s/files/1/0434/7386/2821/files/bokon.pdf
    • https://cdn.shopify.com/s/files/1/0435/0319/0181/files/rogozazojiri.pdf
    • https://cdn.shopify.com/s/files/1/0435/6882/4488/files/instafeed_access_token.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_off000054ef.bin
9754304e865127fb5f85b32c0493cd5000969c92ef6474327a4c0140612b67e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54EF 5548 bytes
font_01_sfnt_off000067ac.bin
186f12ef4aa7b3cca25b92d045b93c2cb9a0bf958a9d7b24711170d135d06d4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67AC 10892 bytes

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