Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6b2248865015e3…

MALICIOUS

PDF

38.0 KB Created: 2020-08-04 21:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f6282f6c0d3890399a354f2565893ca SHA-1: 646189956d7880ad5e4328266fb2130268d9c5b4 SHA-256: bb6b2248865015e342dc44183cc9a8ea966350f79e729fdde597ab1ace3387f7
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.ru. It also exhibits a PDF link farm heuristic, indicating a large number of outbound links, many hosted on Shopify. The document body, though heavily obfuscated, contains the URL and text related to 'irregular verbs exercises advanced pdf', suggesting a lure. The primary malicious IOC is the redirector URL.

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.ru/wb?keyword=irregular%20verbs%20exercises%20advanced%20pdf
    • http://files.stonehillkennels.com/uploads/1/3/2/6/132681698/javisonasajifijorilo.pdf
    • http://suwad.tigermushroomfarms.com/uploads/1/3/0/8/130814921/21bb438cd42.pdf
    • http://files.brookesummers.blog/uploads/1/3/0/9/130968996/zolanax.pdf
    • http://files.seancotton.com/uploads/1/3/2/6/132683088/a819c.pdf
    • http://files.kbassokinesiology.com/uploads/1/3/1/4/131437418/84af0ebff.pdf
    • https://cdn.shopify.com/s/files/1/0439/8622/3262/files/vuzojogoza.pdf
    • https://cdn.shopify.com/s/files/1/0434/1340/5850/files/bugunidomad.pdf
    • https://cdn.shopify.com/s/files/1/0435/6158/2755/files/jokewetoloridomuze.pdf
    • https://cdn.shopify.com/s/files/1/0433/0497/6548/files/vibomurekowinokenojenabim.pdf
    • https://cdn.shopify.com/s/files/1/0434/6534/3126/files/gary_auto_clicker.pdf
    • https://cdn.shopify.com/s/files/1/0432/6345/9486/files/wovoko.pdf
    • https://cdn.shopify.com/s/files/1/0429/7093/9541/files/62803234146.pdf
    • https://cdn.shopify.com/s/files/1/0431/4460/9943/files/sobufa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/bovupikikiwojexowusosoja.pdf
    • https://cdn.shopify.com/s/files/1/0433/7418/2563/files/kuvozebin.pdf
    • https://cdn.shopify.com/s/files/1/0430/6498/3703/files/jeguxulufamabab.pdf
    • https://cdn.shopify.com/s/files/1/0430/8746/2551/files/85619344636.pdf
    • https://cdn.shopify.com/s/files/1/0438/7792/5019/files/kiximofeviveruz.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_off000054d9.bin
0684cc55dbb7ea36a716d5ad2645963df4189e8227bb7a317befac9b1b02f327
pdf-font-stream PDF embedded font (sfnt) at offset 0x54D9 5528 bytes
font_01_sfnt_off000067bd.bin
663fb41942d1038e4b7d8637ed49023bd614d3a626c7fe3fbc785e1feeb1b8d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x67BD 10320 bytes