Malicious PDF — malware analysis report

Static analysis result for SHA-256 35cd5d6fd18b4add…

MALICIOUS

PDF

46.6 KB Created: 2020-08-02 02:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f4fa8f39024b99f88ccbdcbd2782598 SHA-1: ad23d38985bf1b4c715f5b5fc4a3de64e291e9c4 SHA-256: 35cd5d6fd18b4add3e7cac7fa87804f21800207b1764465134e3e1c4c165e67c
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) known for malicious activity. The document body, though partially corrupted, includes the same suspicious URL, suggesting an attempt to trick users into visiting malicious sites. The presence of numerous links, including those hosted on Shopify, indicates a link farm strategy to potentially improve search engine ranking for malicious content or to distribute malware.

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=how+to+convert+string+to+int+c%252B%252B
    • http://files.thebookaboutice.com/uploads/1/3/0/7/130739570/zinopewadexa-dunow-donupu.pdf
    • http://files.srandhh.com/uploads/1/3/1/0/131070216/9c56d.pdf
    • http://files.pennjournalconlaw.com/uploads/1/3/1/8/131871424/xizotubulaxumub.pdf
    • http://files.exoticfeeders.com/uploads/1/3/0/8/130874018/dabafudono_putemekabigipa.pdf
    • https://cdn.shopify.com/s/files/1/0437/2342/3912/files/27851610170.pdf
    • https://cdn.shopify.com/s/files/1/0428/4124/3814/files/pawowabidez.pdf
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/rujekiverebojepudesafivu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5219/files/xovigasezirujanaletajul.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6143/files/wipavotaranobopugu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9806/2501/files/98848029112.pdf
    • https://cdn.shopify.com/s/files/1/0433/8660/1635/files/zurofukebigudegam.pdf
    • https://cdn.shopify.com/s/files/1/0431/9608/8481/files/32969582086.pdf
    • https://cdn.shopify.com/s/files/1/0430/8022/0826/files/linear_circuits_decarlo_3rd_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0437/1572/3414/files/44906885508.pdf
    • https://cdn.shopify.com/s/files/1/0435/5876/4696/files/wamosofagoweso.pdf
    • https://cdn.shopify.com/s/files/1/0434/1350/4156/files/wegewe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0594/3701/files/pulisosawu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1774/0199/files/7261782276.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_off00006a9b.bin
7e125ea053eac6491cd2656d3110414c5afcc7ebf981e6e0e3a6bb811f68c8f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A9B 4840 bytes
font_01_sfnt_off00007b3e.bin
258f95d311ac47a175eeadc83b068fe82fe2703f36b0353b20d9bcf8e318ae1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3E 16100 bytes