Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25dfe286a18fb4b…

MALICIOUS

PDF

52.4 KB Created: 2020-08-04 21:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 673542c7b2caa045923b9fc20310b210 SHA-1: 4d549bc8fc780e1011e5eb56da6c6464bfa4dc1c SHA-256: b25dfe286a18fb4b3dda925c45151ab60f83bde515685ef9a3b5beebff1e50ec
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. One prominent link, 'https://ttraff.ru/wb?keyword=integrated%20chinese%20level%201%20part%202%20workbook%20pdf%20free', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, reinforcing the lure. The presence of a large number of external PDF links, many hosted on Shopify, further suggests an attempt to manipulate search engine results.

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=integrated%20chinese%20level%201%20part%202%20workbook%20pdf%20free
    • http://files.amyfriedenberger.com/uploads/1/3/1/4/131437243/zaxilil.pdf
    • http://files.selfhealingsuperfoods.com/uploads/1/3/1/3/131383934/5ebd4c634.pdf
    • http://files.afreedombooks.com/uploads/1/3/1/4/131438759/623bd2d5da46b.pdf
    • http://files.mariasatira.com/uploads/1/3/1/8/131871963/1402121.pdf
    • https://cdn.shopify.com/s/files/1/0431/3504/1693/files/3800301453.pdf
    • https://cdn.shopify.com/s/files/1/0433/1828/0357/files/dark_souls_2_spells.pdf
    • https://cdn.shopify.com/s/files/1/0429/5625/9491/files/94728470758.pdf
    • https://cdn.shopify.com/s/files/1/0433/0133/9304/files/69690900982.pdf
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/zudobegika.pdf
    • https://cdn.shopify.com/s/files/1/0431/7108/6485/files/97971119847.pdf
    • https://cdn.shopify.com/s/files/1/0428/0942/6079/files/juzafukawusajexugivorazu.pdf
    • https://cdn.shopify.com/s/files/1/0439/0086/2619/files/98119669546.pdf
    • https://cdn.shopify.com/s/files/1/0440/1466/5886/files/152216060.pdf
    • https://cdn.shopify.com/s/files/1/0431/2550/6208/files/convert_mp3_to_video.pdf
    • https://cdn.shopify.com/s/files/1/0431/0954/8188/files/34573394367.pdf
    • https://cdn.shopify.com/s/files/1/0437/3030/5175/files/how_to_host_a_rust_server.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3545/files/vorejisapoko.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f16.bin
7ea87d7c1757672f006474a73a122dfbb272678267aa2eb16a292db5febe08a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F16 3452 bytes
font_01_sfnt_off00007b6d.bin
a20d11b40df8bd4b271e9a7312ba2a71991f12731aa36784b9261e3af5845403		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B6D 5684 bytes
font_02_sfnt_off00008ecc.bin
b7768604abdf6be65040d478e06d673d354cf911fbe7368e94d5c04893a1e592		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ECC 12024 bytes
font_03_sfnt_off0000b510.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB510 4324 bytes

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