Malicious PDF — malware analysis report

Static analysis result for SHA-256 899b7587d12e44d7…

MALICIOUS

PDF

40.6 KB Created: 2020-08-26 14:39:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ce5d346f2d231b38f2880087445bfbe SHA-1: 2efa9d42c0a5880980c4f5796cfcfad75e24973b SHA-256: 899b7587d12e44d74728d5996c330156ec54ef53a120783ecd856fd2ca62d92d
120 Risk Score

Malware Insights

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

The PDF file contains a link farm and a specific URL pointing to a redirector, disguised as information about a 'Draytek vigor 166'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the malicious nature of the redirector. The document body, though heavily obfuscated, contains the target URL and references to the product, reinforcing the lure. The presence of numerous links to external PDFs, many hosted on Shopify, suggests a link farm used for SEO poisoning or to obscure the final malicious destination.

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=draytek+vigor+166
    • http://files.familyandsanctityoflife.org/uploads/1/3/2/7/132712483/sumop.pdf
    • http://telusulev.materials4artists.com/uploads/1/3/1/0/131070420/3684244.pdf
    • http://files.elizabethonjones.com/uploads/1/3/1/8/131857679/nizojukijilej-zunuvuzux-lufevetifu.pdf
    • http://files.lukezaccaro.com/uploads/1/3/1/6/131606619/zixevoroki.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8039/files/86266638575.pdf
    • https://cdn.shopify.com/s/files/1/0429/3731/9590/files/sugefe.pdf
    • https://cdn.shopify.com/s/files/1/0431/9156/6493/files/sutomabixerubowil.pdf
    • https://cdn.shopify.com/s/files/1/0431/3733/5464/files/wipowipelevalalisudipi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9377/8837/files/wifi_driver_for_windows_10_hp.pdf
    • https://cdn.shopify.com/s/files/1/0430/9745/6789/files/vefadedavix.pdf
    • https://cdn.shopify.com/s/files/1/0436/1509/2894/files/solivud.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6677/files/robixukotokizij.pdf
    • https://cdn.shopify.com/s/files/1/0437/5825/6286/files/pulitinukujojebubitepukib.pdf
    • https://cdn.shopify.com/s/files/1/0434/3431/1845/files/lonadimolodunumevovidumem.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_off00005b5f.bin
3fee7924b5289906df3f17b6182cb08f9dc750ae76d62dcb6fae043b9fc65e62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B5F 5076 bytes
font_01_sfnt_off00006cca.bin
7333cf69389e1419396fda513e162528370ea99d966e22257ea2b45f295aa20d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CCA 12704 bytes

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