Malicious PDF — malware analysis report

Static analysis result for SHA-256 d383639dce9f08da…

MALICIOUS

PDF

50.8 KB Created: 2020-08-07 05:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8959bfe340c61fe533b04b7a781e404 SHA-1: 1eec403ca9e54d6189621302b84f1a0cb8e91b23 SHA-256: d383639dce9f08da705b87262d0128886a209cb2ade3edcb6e607fbc4cf8c74b
128 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'dled assignment cover page format pdf' and the malicious URL itself, suggesting a lure to download malicious content. The presence of a 'download button' heuristic further supports this attack pattern. The primary malicious IOC is the redirector URL, which likely initiates a further download or redirects to a malicious site.

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=dled+assignment+cover+page+format+pdf
    • http://masil.irishfeast.com/uploads/1/3/1/4/131406507/68c0c6954cc.pdf
    • http://files.surreymusicschool.co.uk/uploads/1/3/0/8/130813888/vekasepinuvagugewaw.pdf
    • http://files.daradee.com/uploads/1/3/1/0/131070161/fadezuxifisomo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1421/8143/files/roraxivuderaro.pdf
    • https://cdn.shopify.com/s/files/1/0432/5962/5627/files/47631587026.pdf
    • https://cdn.shopify.com/s/files/1/0432/5618/4992/files/40644408277.pdf
    • https://cdn.shopify.com/s/files/1/0428/8747/9455/files/31055242334.pdf
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/bimovoziboxevorakebal.pdf
    • https://cdn.shopify.com/s/files/1/0430/0426/4602/files/54831986517.pdf
    • https://cdn.shopify.com/s/files/1/0431/9572/8029/files/wuvet.pdf
    • https://cdn.shopify.com/s/files/1/0437/1110/3128/files/coercive_leadership.pdf
    • https://cdn.shopify.com/s/files/1/0434/8451/2406/files/60589136537.pdf
    • https://cdn.shopify.com/s/files/1/0435/3176/3864/files/10041035673.pdf
    • https://cdn.shopify.com/s/files/1/0432/5569/3470/files/51256387293.pdf
    • https://cdn.shopify.com/s/files/1/0432/8020/3944/files/maryland_manual_del_conductor.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064cb.bin
1ca1023d2ce8744b8b6528ab85cf515d5f9b1eb31a6c5674ad103369ea91b515		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64CB 5320 bytes
font_01_sfnt_off000076c7.bin
2ad1773b67127636a5f70ec5ebcdcd47eb50bbcaf4c597fe61528e9309c16ebc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76C7 7912 bytes
font_02_sfnt_off00008c96.bin
a055da101c020cf47c1a421c50474eeaa4b7822a0effc8eed6459966de5ee8fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C96 10280 bytes
font_03_sfnt_off0000af86.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF86 4324 bytes

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