Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d8a9bc7f6b892a…

MALICIOUS

PDF

38.7 KB Created: 2020-08-09 08:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 607e8b7be027f9d94e09cd4804402e62 SHA-1: b30933ff02076eaf422a251b2c0c3245686c3ca6 SHA-256: d8d8a9bc7f6b892a2e42885469864f1cd582f0d75536a8f6fef434b83f35db57
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many of which point to external PDF files hosted on Shopify. One critical heuristic identified a link to a known malicious redirector infrastructure at `https://ttraff.cc/pify?keyword=absolute+value+worksheets+7th+grade+pdf`. This suggests the document is designed to act as a link farm, potentially leading users to malicious sites or phishing pages. No scripts were extracted from this sample.

Heuristics 3

  • 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.
  • 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=absolute+value+worksheets+7th+grade+pdf
    • http://files.dalesbus.org/uploads/1/3/1/3/131378918/2a4185942a7621.pdf
    • http://files.askwiseguys.com/uploads/1/3/1/4/131453062/mezifizotusuk_dotisiwozeremi.pdf
    • http://files.divinemuses.net/uploads/1/3/0/7/130776776/divimajoduwetupev.pdf
    • http://files.jillkinnear.com/uploads/1/3/0/9/130969744/vuzebuf-torizidu-zevumerasamis.pdf
    • https://cdn.shopify.com/s/files/1/0430/4030/9402/files/zanewugejodogumuwetosibi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7044/0095/files/wisopuxafuxedunira.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/golalebilafofuzugetuvi.pdf
    • https://cdn.shopify.com/s/files/1/0441/1044/6744/files/learning_english_grammar_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/3757/9674/files/6440979045.pdf
    • https://cdn.shopify.com/s/files/1/0433/2149/1621/files/22758818.pdf
    • https://cdn.shopify.com/s/files/1/0429/1395/6006/files/tile-_service._weather._microsoft._com.pdf
    • https://cdn.shopify.com/s/files/1/0429/7054/6335/files/50643718845.pdf
    • https://cdn.shopify.com/s/files/1/0436/4782/8133/files/bekowi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3184/5271/files/20503113352.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/pathfinder_monsters_by_cr.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9870/files/riwexepefated.pdf
    • https://cdn.shopify.com/s/files/1/0433/6274/6517/files/assertive_communication.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_off0000579b.bin
7131c25b597cbd0869ff0b2001f3a10c7b46aa1f3e109fce891c87dbfbd1304f
pdf-font-stream PDF embedded font (sfnt) at offset 0x579B 5728 bytes
font_01_sfnt_off00006b31.bin
b1c28c3d542d5dbfb077fa88321191df6496007d4c5ffbc11328fc7f320989cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B31 10068 bytes