Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd88fa5a1f134066…

MALICIOUS

PDF

41.9 KB Created: 2020-09-06 02:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 015a191794869d4c91495ce4f0340072 SHA-1: 7725adec9bf6a102aefd85ab10b2eabd06844248 SHA-256: bd88fa5a1f1340663d898475b189c1da72f8855a82db7766615a789a81e9c175
150 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL, 'https://ttraff.me/wix?keyword=adjectives+and+adverbs+practice+worksheets', is flagged as a malicious redirector. The document body, though partially corrupted, suggests a lure related to educational worksheets, likely to trick users into clicking the malicious link. The presence of a PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing and the ML_NYX_PDF_MALICIOUS flag strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.me/wix?keyword=adjectives+and+adverbs+practice+worksheets
    • https://static.usrfiles.com/ugd/aef5b7_14658db77e3c444f9165993c9ca8a028.pdf
    • https://static.usrfiles.com/ugd/0adedf_1a707df22a624e52ba391a5200ebbe0e.pdf
    • https://static.usrfiles.com/ugd/cd79e3_52a566d46a1e40a886f0acccf05bf6d9.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_ba8225c5d5c440d888d59f161e43a65d.pdf
    • https://static.usrfiles.com/ugd/2c608b_94ac9b5b540f47869e9281403ecac8f3.pdf
    • https://static.usrfiles.com/ugd/0d2908_5daa53bd42f0418bad448cbacb5bd478.pdf
    • https://static.usrfiles.com/ugd/6924eb_e0993cfa9c6949f6963e3f4f215ab86c.pdf
    • https://static.usrfiles.com/ugd/0f1814_03ddaa1f68514a10a960c5b7dc846fdc.pdf
    • https://cdn.shopify.com/s/files/1/0434/2166/3397/files/accuracy_and_precision_in_analytical_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0427/6443/5612/files/lotem.pdf
    • https://cdn.shopify.com/s/files/1/0429/3017/6159/files/momakibitifezozibok.pdf
    • https://cdn.shopify.com/s/files/1/0432/8177/6795/files/veterans_day_pictures_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vibuzos.pdf
    • https://cdn.shopify.com/s/files/1/0437/4020/1109/files/50787577444.pdf
    • https://cdn.shopify.com/s/files/1/0428/5821/7631/files/salary_certificate_form_16.pdf
    • https://cdn.shopify.com/s/files/1/0433/8938/6901/files/84758938400.pdf
    • https://cdn.shopify.com/s/files/1/0431/4831/2730/files/46331242876.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_off0000669b.bin
6fcfc6efcf0fbe671a588bc5c10ef3bb3a110ba496aebeb00325bf27c9494d3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x669B 5552 bytes
font_01_sfnt_off0000798a.bin
6816172867eeabd6f4e819abc1715f7de8ff4027844ea07e49080486abec3d87
pdf-font-stream PDF embedded font (sfnt) at offset 0x798A 9708 bytes