Malicious PDF — malware analysis report

Static analysis result for SHA-256 3837c611bc334d86…

MALICIOUS

PDF

48.5 KB Created: 2020-09-01 05:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d464f06f4bf18fe775e1f0466ec34c0 SHA-1: aaefbeba6f7a8ce179c81d0c48b84f5fe9bce23e SHA-256: 3837c611bc334d8637ae10823f202ab4bf87f4986708d76b4ac2c5e4da7fc777
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, a technique often used to create SEO spam or to redirect users to malicious sites. One of the primary URLs, 'https://ttraff.ru/wix?keyword=whatsapp+status+punjabi+funny+video++mp4', is flagged as a known malicious redirector. The document body contains garbled text along with this URL and other benign-looking PDF links, suggesting an attempt to disguise the malicious intent.

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/wix?keyword=whatsapp+status+punjabi+funny+video++mp4
    • https://static.usrfiles.com/ugd/de65f7_1ad3aa1e2ea849f09391352ca386b5da.pdf
    • https://static.usrfiles.com/ugd/5be868_7fa5487ddb23444c933f58758cac8437.pdf
    • https://static.usrfiles.com/ugd/b8c837_90e543a84ac842c8b8da92c186c818f7.pdf
    • https://cdn.shopify.com/s/files/1/0429/0550/1852/files/dasgupta_vazirani_algorithms.pdf
    • https://cdn.shopify.com/s/files/1/0433/4488/7966/files/english_b1_grammar_test.pdf
    • https://cdn.shopify.com/s/files/1/0433/6631/8230/files/mimobavupejadatarepemi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4417/5013/files/sekovexonagolatelu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7042/2180/files/82467206970.pdf
    • https://static.usrfiles.com/ugd/5899d5_f75dc98bad0e4d83b500ce17113be852.pdf
    • https://static.usrfiles.com/ugd/f09a9d_b91e8b309d494e309a0a9f9c905a8791.pdf
    • https://static.usrfiles.com/ugd/f63f29_33aabd39c32e497f94e820574ef1ceac.pdf
    • https://static.usrfiles.com/ugd/9421c8_0ea77f2921ab44f7815fe125f82ab2f6.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/katisasuxofi.pdf
    • https://cdn.shopify.com/s/files/1/0440/4012/6614/files/lavesepotejafasuduz.pdf
    • https://cdn.shopify.com/s/files/1/0432/2259/7800/files/analytical_thinking.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/megoxidojixugapilanaseg.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9397/files/23203861778.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_off00007d07.bin
195a859813e42dd6856be9cd9316e135cd1539be0f26789a7539de54cb3f3db9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D07 5632 bytes
font_01_sfnt_off00009027.bin
42701fe2c8df23ffd47c6855083e4cd0425ef10d637d7fd398326d06a89045bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9027 10776 bytes

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