Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96250bb855b9491…

MALICIOUS

PDF

37.2 KB Created: 2020-08-04 06:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b2ba974cc245ed4d09594af50a47e76 SHA-1: 042ec667c9b79b2d6dba50e21ec30a29ee3c9148 SHA-256: a96250bb855b9491c5e5755b5fda4e6a0c7e1b104a5fd28b768fbb54fec9baf6
128 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to a link farm hosted on Shopify. One critical heuristic indicates that a link within the PDF redirects to known malicious infrastructure via 'ttraff.cc'. The document body, though heavily obfuscated, contains text that appears to be a lure for free books, combined with the malicious redirector URL. This suggests a phishing or redirection attack aimed at delivering further malicious content.

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/pify?keyword=free+medical+biochemistry+books+pdf
    • http://files.sdadata.org/uploads/1/3/1/4/131406849/domiwatu.pdf
    • http://files.agathahomehealth.com/uploads/1/3/1/3/131379792/potav-mudikojoki-siwajozurijulem-vegiwajeve.pdf
    • http://files.alexasnyderstudio.com/uploads/1/3/0/9/130969356/9843479.pdf
    • http://files.lavahistory.com/uploads/1/3/1/4/131406520/572069.pdf
    • https://cdn.shopify.com/s/files/1/0430/8611/9079/files/goxuzitifomulep.pdf
    • https://cdn.shopify.com/s/files/1/0430/8028/6372/files/cateterismo_cardiaco_en_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0434/2824/9767/files/ancova_test_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0432/6857/1299/files/62746323873.pdf
    • https://cdn.shopify.com/s/files/1/0438/9981/4056/files/5680936048.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bodadajigewodozisidezufe.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/fagoketila.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/40776526816.pdf
    • https://cdn.shopify.com/s/files/1/0430/2051/7537/files/witcher_3_guide_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/5783/9254/files/11202704005.pdf
    • https://cdn.shopify.com/s/files/1/0428/2214/0063/files/53617968681.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_off000053d4.bin
023e2bbac4a76d68bf2548d8798ac599d6811aa1dea5bd6e0d04c336c3899b82
pdf-font-stream PDF embedded font (sfnt) at offset 0x53D4 5656 bytes
font_01_sfnt_off000066e5.bin
d9ecd3a8fc70234735f19f88118e16372cbe28474606d10007e3acd504c94565
pdf-font-stream PDF embedded font (sfnt) at offset 0x66E5 9756 bytes