Malicious PDF — malware analysis report

Static analysis result for SHA-256 375b0f4ebfe712b8…

MALICIOUS

PDF

40.0 KB Created: 2020-08-12 04:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4836c34e1156edd5669ea32ca36d63d0 SHA-1: 3a9c924a10c395887e3c2bd2019b8d050f559e63 SHA-256: 375b0f4ebfe712b8c3dee4657fc7e9d6568bdb71624830e5355822f3dabe04a7
128 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a helpful guide for merging PDFs. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the link points to known malicious infrastructure. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many of which are likely part of a link farm to improve search engine ranking for malicious content. The document body and embedded URLs reinforce the lure of a PDF-related topic.

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.com/wb?keyword=how%20to%20merge%20pdfs%20using%20foxit%20reader
    • http://files.yakimafamilyfarmers.org/uploads/1/3/0/7/130775076/6465017.pdf
    • http://files.iamdjchizz.com/uploads/1/3/2/6/132681201/7aef2cb0948424.pdf
    • http://files.atlaslincoln.org/uploads/1/3/0/7/130776001/2385120.pdf
    • http://files.bethannysbabies.com/uploads/1/3/1/4/131437655/gifizaritugibujur.pdf
    • http://resuke.marvlindbergmysteries.com/uploads/1/3/0/8/130873851/5711153.pdf
    • https://cdn.shopify.com/s/files/1/0437/7808/0919/files/vezajakulijazudat.pdf
    • https://cdn.shopify.com/s/files/1/0435/5322/6913/files/61806308648.pdf
    • https://cdn.shopify.com/s/files/1/0430/8588/9689/files/68679532415.pdf
    • https://cdn.shopify.com/s/files/1/0431/3926/8769/files/94856315597.pdf
    • https://cdn.shopify.com/s/files/1/0434/0688/5020/files/73268748609.pdf
    • https://cdn.shopify.com/s/files/1/0434/0491/8941/files/tedulajubimujotalixesope.pdf
    • https://cdn.shopify.com/s/files/1/0437/4190/5045/files/rodomimuxi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5625/0525/files/34370441576.pdf
    • https://cdn.shopify.com/s/files/1/0437/5032/6426/files/24771238055.pdf
    • https://cdn.shopify.com/s/files/1/0435/9516/9951/files/tujedorafetu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3903/8359/files/ruxaxebazojutewavemogoji.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11783771814.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_off00005c81.bin
a842b438fe1317375361ba396cbca012fc60dc6025594afb5dd2ec60ce04934b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C81 5452 bytes
font_01_sfnt_off00006f13.bin
add161d8b1f3bc1c2ace2e4ecccf5dd0c2c2ded637b6b896c8386dbf8f462830
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F13 10520 bytes