Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed9c3a5f931e3b2c…

MALICIOUS

PDF

43.4 KB Created: 2020-08-13 07:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a3d7a6544e6c19d88e8a9860a7f3516 SHA-1: 7e6a0824ea553f1e19cad8731d5adee5f63cba06 SHA-256: ed9c3a5f931e3b2c5a22e4b8cc3280e6c6eb3b03dded0672080d742a54759060
128 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link redirects to known malicious infrastructure. The document body text, though partially corrupted, contains the phrase 'Time management worksheet for students pdf' and the malicious redirector URL, suggesting a lure to trick users into downloading further malicious content. The presence of a visual download button heuristic further supports this phishing pretext.

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.cc/wb?keyword=time%20management%20worksheet%20for%20students%20pdf
    • http://refeju.goatskins.com/uploads/1/3/2/7/132740328/6c533bbe2c1377c.pdf
    • http://files.couples-eft.com/uploads/1/3/0/7/130776720/1028152.pdf
    • http://demikawu.nataliebrite.com/uploads/1/3/1/3/131381204/69e9bb.pdf
    • http://zolaza.midamericaallianceforafricanstudies.org/uploads/1/3/1/3/131379530/2345106.pdf
    • https://cdn.shopify.com/s/files/1/0436/1158/6722/files/loropepitixa.pdf
    • https://cdn.shopify.com/s/files/1/0434/0934/2621/files/ubuntu_stuck_on_boot.pdf
    • https://cdn.shopify.com/s/files/1/0429/5468/6630/files/manual_chiller_carrier_30hxc.pdf
    • https://cdn.shopify.com/s/files/1/0433/4590/3774/files/kuwakiraz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0679/5686/files/bluebook_citation_20th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/0995/0367/files/xifajiveso.pdf
    • https://cdn.shopify.com/s/files/1/0432/9380/2646/files/50126222462.pdf
    • https://cdn.shopify.com/s/files/1/0430/6308/3162/files/bipajatufipu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3075/8054/files/60970052455.pdf
    • https://cdn.shopify.com/s/files/1/0435/5905/9615/files/pm_awas_yojana_form_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/3461/5708/files/lupaluxofuvovamotisedavin.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_off0000656b.bin
e8d30f32acbc4573d280b250dab9c3f12937a77e8cb889924b192ccbff10bf8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x656B 5528 bytes
font_01_sfnt_off0000781a.bin
ffea167052c5d6be5e41ad7de5aae333fd7ec4e537c52d54bdfb41efd824bf81
pdf-font-stream PDF embedded font (sfnt) at offset 0x781A 12752 bytes