Malicious PDF — malware analysis report

Static analysis result for SHA-256 b958458fbd7a03f3…

MALICIOUS

PDF

41.6 KB Created: 2020-07-25 14:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a28ff1f62ad616332cbc9dceae2f0a8 SHA-1: 3e29314f90561cf94c3ca8fdd99c1afd4aaf9571 SHA-256: b958458fbd7a03f3a62454bbd7f35e9b732a7f342bf900aa9d8a00adf130d351
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF file contains numerous embedded links, a technique often used for SEO link farming to improve search engine rankings for malicious sites. One critical heuristic identified a link to a known malicious redirector at 'ttraff.ru', which is likely intended to lead the user to a phishing or malware distribution site. The document body, though heavily obfuscated, contains text related to PDF conversion, suggesting a lure to disguise the malicious intent. The presence of multiple Shopify-hosted PDF links further supports the link farming hypothesis.

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/wb?keyword=convert%20pdf%20to%20jpg%20online%20free%20unlimited
    • http://files.janetraino.com/uploads/1/3/1/3/131380467/novufasuj-gupoxenet-tutiwa.pdf
    • http://files.bollywood-dreams.jp/uploads/1/3/2/6/132683070/losuwe_napasebaw_fodawot_zakazezeg.pdf
    • http://files.jemfloorcovering.co/uploads/1/3/0/7/130775868/8416281.pdf
    • http://files.bettingonasecondchance.com/uploads/1/3/1/4/131411474/5374328.pdf
    • http://files.betti
    • https://cdn.shopify.com/s/files/1/0431/3694/2234/files/numozelulunujuwefo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0432/1184/files/pozidavadinavi.pdf
    • https://cdn.shopify.com/s/files/1/0436/4405/9806/files/fivesu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinubigelezegir.pdf
    • https://cdn.shopify.com/s/files/1/0433/8148/9829/files/bijaner.pdf
    • https://cdn.shopify.com/s/files/1/0430/3850/7169/files/72150832901.pdf
    • https://cdn.shopify.com/s/files/1/0433/5216/2462/files/42785386531.pdf
    • https://cdn.shopify.com/s/files/1/0436/5356/2526/files/27400955500.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1534434062.pdf
    • https://cdn.shopify.com/s/files/1/0434/6563/8050/files/mubiw.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_off0000654c.bin
58c9d44c539f81a10ebb29421eaea696efc8a0d09121e2649661a05666cec32d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x654C 5016 bytes
font_01_sfnt_off0000765b.bin
4ce53cae913136395c9245c1d85f52a089e8299ae9fc3d9ccebe3d77894a892c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x765B 10212 bytes

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