Malicious PDF — malware analysis report

Static analysis result for SHA-256 7547f8eb2b9cf6f8…

MALICIOUS

PDF

33.3 KB Created: 2020-07-29 17:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8083f84f90c304a96db47ac369d7ff31 SHA-1: b647eca112af08d549ab8b26eb97ee8556caf7d6 SHA-256: 7547f8eb2b9cf6f8cd85ceed87ae7bfa4eab0df3739e2b14cf3852edb7f07600
140 Risk Score

Malware Insights

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

The PDF is an image-only lure, typical of phishing campaigns, and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also contains a large number of external PDF links, many hosted on cdn.shopify.com, suggesting a link farm or SEO poisoning tactic. The primary malicious URL identified is ttraff.ru, which redirects based on the '1001 algebra problems pdf' keyword.

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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 2 image(s), only 0 text block(s), carries a click-outward action, and is only 33 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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=1001+algebra+problems+pdf
    • http://files.bombaybazaar.com/uploads/1/3/1/3/131383838/misekugipomovok.pdf
    • http://files.thesouthernmedium.com/uploads/1/3/0/7/130775108/vojadawite_wudisobufor.pdf
    • http://files.siceyourlife.com/uploads/1/3/2/7/132712508/1decdb041c0c.pdf
    • https://cdn.shopify.com/s/files/1/0428/2531/8563/files/tugob.pdf
    • https://cdn.shopify.com/s/files/1/0431/7659/1509/files/jetozirosezu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2742/9536/files/magavun.pdf
    • https://cdn.shopify.com/s/files/1/0432/4022/6984/files/33024617392.pdf
    • https://cdn.shopify.com/s/files/1/0434/6527/7605/files/fufawubibufoduvidu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2421/9293/files/xabomogozazo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3067/4597/files/dorokifadejiso.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7903/files/70111433934.pdf
    • https://cdn.shopify.com/s/files/1/0432/2295/8248/files/leripova.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_off00004bf8.bin
54f2c927a32f6fffeab054b9035b5d8e39d47ebab7642c93509686c0c5b9cc99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BF8 5156 bytes
font_01_sfnt_off00005d66.bin
9fe01cfe3f2c9d35571218e35e704ef12233199d7af674625bca61c44b617f3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D66 7968 bytes

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