Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4563eb13d1ac784…

MALICIOUS

PDF

42.8 KB Created: 2020-09-18 04:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 624fd30515a97e42d829f6d4e0705ea7 SHA-1: 50a4eefe86c20af38112d72e178821ae939054d8 SHA-256: a4563eb13d1ac784c8947ed78be42aa830202cd35e43b831a0c4af36d333b15c
128 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains text related to 'types of chemical reactions webquest answer key' and a URL that matches the malicious redirector. This indicates a social engineering lure to trick users into visiting a malicious site. The PDF also contains a link farm, suggesting an attempt to manipulate search engine results or distribute 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.club/wix?keyword=types+of+chemical+reactions+webquest+answer+key
    • http://zivapezas.theriftny.com/uploads/1/3/1/4/131407178/8374232.pdf
    • http://gavason.jh-porcelain.com/uploads/1/3/1/3/131381787/pagabefejubilewezor.pdf
    • http://files.friederikeluisekelle.com/uploads/1/3/2/6/132683181/6947924.pdf
    • http://files.polishedspurtackco.com/uploads/1/3/2/6/132695530/kamoxufifovij.pdf
    • http://somateke.drmelissacordero.com/uploads/1/3/0/7/130739024/9372686.pdf
    • http://files.asapartcentre.com/uploads/1/3/0/9/130969735/furunolelob-dakalajipuwel-mebufomasufol-reluk.pdf
    • http://redabit.thetriptheater.net/uploads/1/3/1/4/131408984/7f04a52a1.pdf
    • https://cdn.shopify.com/s/files/1/0433/7506/7297/files/aha_bls_questions_and_answers_2017.pdf
    • https://cdn.shopify.com/s/files/1/0428/1624/1831/files/bokuvidabefuwisipiletu.pdf
    • https://0bacdd8f-b0d8-4d6a-a2d3-a79cb025f890.filesusr.com/ugd/89c6ad_aa525468fb4f488c96c0264ea4db0fd4.pdf?index=true
    • https://0271539a-8c4f-49ba-bb93-eb446802c771.filesusr.com/ugd/4bb894_092e56dbc23b469e8a5a2f2edf3fb246.pdf?index=true
    • https://36ba66f7-5dba-43b6-8197-ba1bf37b65a2.filesusr.com/ugd/4e977a_ff5b36f7f7a04bb88d556c3fee4e8953.pdf?index=true
    • https://7cf8ac05-3ebf-4dc1-9e6f-43150784079e.filesusr.com/ugd/a43ec6_f82b1bcb1c1e4e35b845be2d254d949f.pdf?index=true
    • https://0ad33f1d-d02c-4aef-aece-ca19206bbf19.filesusr.com/ugd/e42c35_21d5753a80504d46b6b83d666a6fee5f.pdf?index=true
    • 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_off0000676a.bin
4f4f087edb1d168039a3d007f4ff055f6110e8fd06fc69a5d1b1e5f9e235b60d
pdf-font-stream PDF embedded font (sfnt) at offset 0x676A 5728 bytes
font_01_sfnt_off00007ad9.bin
b862d07ee42f0f3a42597de88b0940f8631bc5213a8637365ea0d2b3fae07e96
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD9 10308 bytes