Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23fefd276dc3362…

MALICIOUS

PDF

42.9 KB Created: 2020-08-26 05:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99acefde84066966c417544461a5ce68 SHA-1: 20a73c3b44eb5d74007f5ab06bf62b367600f904 SHA-256: b23fefd276dc336243ce6c8b6e3fcc3cafa0aaf730e55404d74e3057cc3cefc3
128 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, contains text suggesting a lure related to interview follow-ups, combined with urgency language. The primary malicious IOC is the redirector URL, which likely leads to a phishing page or malware download. The file also contains a large number of links to other PDFs hosted on Shopify, potentially for SEO manipulation or to obscure the malicious redirector.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=thank+you+letter+after+second+interview+examples
    • http://files.eastasiaelite.com/uploads/1/3/1/8/131856108/ca648.pdf
    • http://files.helpinghandsrescue.org/uploads/1/3/2/8/132816036/gijanivomed.pdf
    • http://tudaf.woodsinbloom.com/uploads/1/3/1/4/131407552/9861067.pdf
    • http://files.rooseveltvanderbilt.org/uploads/1/3/0/8/130813511/vewatagej.pdf
    • http://files.unstoppableachievers.com/uploads/1/3/1/1/131164568/ab0f4d58f.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/peboginesewuxexadamo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/buzojenafiwibujug.pdf
    • https://cdn.shopify.com/s/files/1/0444/6437/3927/files/lookup_function_in_reporting_services.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9959313526.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lofexunixepufatomubudabak.pdf
    • https://cdn.shopify.com/s/files/1/0434/6406/5188/files/10241625142.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8656/files/california_dreamin_chords.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1942/files/pogisasajoluvexuwilowiz.pdf
    • https://cdn.shopify.com/s/files/1/0432/3160/8989/files/markup_drawings_on_ipad.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_off0000672e.bin
323c49e3246a59db754dd24e1d3c1e7e24f8cf98af1159b9edb566bb7ef1e6a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x672E 5728 bytes
font_01_sfnt_off00007a9b.bin
1b7553afa97a92746444c7132d52707734cd68228f3704a3fca5cdda3a353a6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A9B 10552 bytes