Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a32763aaede24b1…

MALICIOUS

PDF

42.3 KB Created: 2020-07-31 03:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56b3d79ee91f27e558809631414a39e9 SHA-1: c51a3574aa002adad1675f2fe11aa00c5e9fde9d SHA-256: 8a32763aaede24b14a2f73f8ddc4f04548223e5a78faf549199913209a39c915
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to a known malicious redirector. Additionally, PDF_SEO_LINK_FARM indicates the document is part of a link farm designed to manipulate search engine results. The primary IOC is the redirector URL, which is likely the first step in a malicious chain. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf.

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/pify?keyword=dependent+and+independent+clause+exercises+with+answers+pdf
    • http://files.billandmissykollar.com/uploads/1/3/1/8/131871621/8431a392a3.pdf
    • http://files.vinylbandits.com/uploads/1/3/0/7/130738673/bukogod-mugufidanamuxak.pdf
    • http://files.jayhaigh.com/uploads/1/3/1/3/131381946/mugojolojifewariso.pdf
    • http://files.vinylbandits.com/uploads/1/3/0/7/130738673/bukogod-mug
    • https://cdn.shopify.com/s/files/1/0430/0177/4233/files/zovunuvafuburupawomif.pdf
    • https://cdn.shopify.com/s/files/1/0427/4801/8855/files/wafobojoduwefivefevimi.pdf
    • https://cdn.shopify.com/s/files/1/0439/4975/2478/files/velolizaxivepigapud.pdf
    • https://cdn.shopify.com/s/files/1/0441/0372/9304/files/wemavutufezanobopon.pdf
    • https://cdn.shopify.com/s/files/1/0431/6925/1492/files/birosexolozu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5511/1589/files/89789436275.pdf
    • https://cdn.shopify.com/s/files/1/0434/9411/3446/files/jomopawefonitejas.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53635556436.pdf
    • https://cdn.shopify.com/s/files/1/0430/4994/3202/files/luloduninaziruxuguwi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6586/files/97966023302.pdf
    • https://cdn.shopify.com/s/files/1/0437/6539/9713/files/pakedob.pdf
    • https://cdn.shopify.com/s/files/1/0428/9822/7353/files/28433551585.pdf
    • https://cdn.shopify.com/s/files/1/0434/3778/5240/files/gofumaruzujawexoxola.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_off00006888.bin
54b6cd791b174aa2128f593353b6bf74eaf4a872c920244263cd7e322b51324d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6888 5172 bytes
font_01_sfnt_off00007a27.bin
f3f48e179a85bd7da4d55974bd9485e45331d87e8a22669978d7df350c04021a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A27 9808 bytes

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