Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9dbea59f3f1e8db…

MALICIOUS

PDF

59.4 KB Created: 2020-07-30 19:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cd5fa783e1fb51ce95cc65e9c36fdc5 SHA-1: 4487e45030c411dac755b533c232e919ca2a3fe7 SHA-256: b9dbea59f3f1e8dbbc57bb45ba903665af2d58b890572d85f1d75b68673a266b
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that the link at 'https://ttraff.cc/pify?keyword=advanced+computer+architecture+parallelism+scalability+programmability+pdf' points to known malicious infrastructure. Additionally, the 'PDF_SEO_LINK_FARM' heuristic indicates a mass of external PDF links, suggesting a tactic to artificially inflate search engine rankings or distribute content through a large number of seemingly benign but controlled URLs. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf.

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.cc/pify?keyword=advanced+computer+architecture+parallelism+scalability+programmability+pdf
    • http://files.lowerbrimleycoombefarm.com/uploads/1/3/0/7/130739076/2654222.pdf
    • http://files.thevamcommanders.com/uploads/1/3/1/1/131164118/refuzagosopi.pdf
    • http://files.waddellapples.com/uploads/1/3/2/7/132741149/090169.pdf
    • http://files.oldbostwicks.com/uploads/1/3/2/7/132740399/4567209.pdf
    • http://files.pblplace.com/uploads/1/3/0/7/130775588/sabokefuwo_gotirusugito.pdf
    • http://files.waddellapples.com/uploads/1/3/2/7/132741149/09016
    • https://cdn.shopify.com/s/files/1/0429/5042/6780/files/94923595402.pdf
    • https://cdn.shopify.com/s/files/1/0429/0933/5715/files/53768173958.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gidawibozifuniji.pdf
    • https://cdn.shopify.com/s/files/1/0428/3881/8982/files/tajepixofazu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9986/4734/files/papobimorewi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94215193789.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9621/files/telexefo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1570/7551/files/sanemupinevefotibeg.pdf
    • https://cdn.shopify.com/s/files/1/0430/7556/7777/files/tipavowojofapizob.pdf
    • https://cdn.shopify.com/s/files/1/0432/0700/0219/files/kipoxugadapow.pdf
    • https://cdn.shopify.com/s/files/1/0433/5311/2735/files/bazexodemej.pdf
    • https://cdn.shopify.com/s/files/1/0429/0579/6774/files/66542288832.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/tanixilofugutopukitofol.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_off0000a981.bin
dfcfa6bea67799ab26ccc157f64a83e3449178b888fb154931ef98d8f1a047a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xA981 5740 bytes
font_01_sfnt_off0000bcda.bin
7e2c651b13808a1b256fa1bd7695d2105f1fd930e7b2e17729f17689ee4804e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDA 10160 bytes