Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa40ad2a760c12b0…

MALICIOUS

PDF

39.7 KB Created: 2020-08-21 19:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c7a03d6fcffa89d0237fe9d83954d46 SHA-1: 8738cfd601a096dbdb542de0342abad696e92a8f SHA-256: aa40ad2a760c12b088d48636f78100a4a0bac04862d0bfe1af8b38ff95e30575
128 Risk Score

Malware Insights

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

The PDF file contains a lure for 'free printable math worksheets' which is intended to trick the user into clicking an embedded link. This link, https://ttraff.cc/pify?keyword=free+printable+math+worksheets+elapsed+time, redirects to malicious infrastructure. The file also contains a large number of links to PDFs hosted on Shopify, likely for SEO manipulation or to appear more legitimate. No scripts were extracted, but the primary malicious behavior is the redirection to a known malicious 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.cc/pify?keyword=free+printable+math+worksheets+elapsed+time
    • http://files.pivotalconcepts.com/uploads/1/3/0/7/130739693/jofumenediwe-fefazosenuba.pdf
    • http://files.andrewmoschetti.com/uploads/1/3/1/4/131454114/fipuw-kivopatilawo.pdf
    • http://files.recessionals.org/uploads/1/3/0/8/130874122/pipadapef_baxixasar_numetifibodukat_bojakaxexedamu.pdf
    • https://cdn.shopify.com/s/files/1/0440/0257/4494/files/12796357640.pdf
    • https://cdn.shopify.com/s/files/1/0430/2857/8467/files/lavigekalarutufuji.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3924/files/45252323339.pdf
    • https://cdn.shopify.com/s/files/1/0449/1480/2855/files/colouring_sheets_animals_hard.pdf
    • https://cdn.shopify.com/s/files/1/0432/4940/2024/files/28917097595.pdf
    • https://cdn.shopify.com/s/files/1/0448/5827/8050/files/fast_reader_linux.pdf
    • https://cdn.shopify.com/s/files/1/0431/1397/1861/files/57330172650.pdf
    • https://cdn.shopify.com/s/files/1/0433/6159/9656/files/69104129296.pdf
    • https://cdn.shopify.com/s/files/1/0433/5376/8090/files/raluvatugimex.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_off000058ec.bin
4381abff39625855e2776a8ebdf701910e07db1657e44a71758d5bb67644d69b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58EC 5448 bytes
font_01_sfnt_off00006b4b.bin
41288c760ed9d83a1356f2e3049095ca70228c115766b90c8c4c29a7fe2f0d3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B4B 11524 bytes

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