Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b88cbe3c61dbc54…

MALICIOUS

PDF

36.7 KB Created: 2020-08-10 12:38:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d57f85590982f6b11f0176d7e50ae93d SHA-1: 359c35c44fdf5f3de1b2a730dba37c3d4df1a359 SHA-256: 4b88cbe3c61dbc5421ad860b6dae8f9f4bc41098522fa0402502e3a1ffd4d126
128 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, masquerading as a 'participial adjective exercise pdf'. One of these links, 'https://ttraff.com/pify?keyword=participial+adjective+exercise+pdf', is identified as a malicious redirector. The document body also contains a high volume of links pointing to Shopify domains, likely part of a link farm to improve SEO for malicious content. The presence of a 'download button' heuristic further supports the lure to click the malicious link.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=participial+adjective+exercise+pdf
    • http://files.retroupholstery.com/uploads/1/3/1/4/131437530/807ed1e1.pdf
    • http://files.glasgowchamber.net/uploads/1/3/1/4/131453045/1405273.pdf
    • http://mexigas.gcaschool.org/uploads/1/3/1/0/131070872/vinurajuvedir_mefalumole_bilikukibapi.pdf
    • http://vulisaviw.openstudiotours.com/uploads/1/3/1/0/131070450/b6581ccba01.pdf
    • http://gepijiwe.youngachieversokc.org/uploads/1/3/0/8/130874317/xajurupadipovuj_ravuzaforolel_sinuramuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/8766/7104/files/74981334223.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vibemegabixowosepabotabux.pdf
    • https://cdn.shopify.com/s/files/1/0447/8540/2013/files/argumentative_paragraph_about_smoking.pdf
    • https://cdn.shopify.com/s/files/1/0431/0473/1300/files/tuxujasibazotef.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/close_corporation_act_south_africa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/68561305536.pdf
    • https://cdn.shopify.com/s/files/1/0433/2558/7609/files/61186580172.pdf
    • https://cdn.shopify.com/s/files/1/0428/5592/3878/files/faliritikidamuxexikoko.pdf
    • https://cdn.shopify.com/s/files/1/0434/0324/7781/files/90184649132.pdf
    • https://cdn.shopify.com/s/files/1/0434/6865/2697/files/tropical_geomorphology.pdf
    • https://cdn.shopify.com/s/files/1/0427/6197/8023/files/read_incest_comics.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_off00004f9a.bin
885fe68019aa7c4afa7d11518f939aa9b7fe644f9afb3093db3ad3b928677371
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F9A 5352 bytes
font_01_sfnt_off000061e9.bin
7dc655b7e6b39e58363a1f9f1036e7f955118a476d24b691a79d27c13cab8c04
pdf-font-stream PDF embedded font (sfnt) at offset 0x61E9 9976 bytes