Malicious PDF — malware analysis report

Static analysis result for SHA-256 89304c848c66b00e…

MALICIOUS

PDF

39.0 KB Created: 2020-08-15 05:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c03df603aeb837d62564a2d0afbedb1 SHA-1: c2b728058382cdbb2fb65278a27462a60057841b SHA-256: 89304c848c66b00e536e5d3c9b885c159fa41670a98de2eb1f800988048dec1c
128 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains the text 'Exercise on simple past tense with answers' and the malicious URL, suggesting a lure to disguise the malicious redirection. The presence of a 'download button' heuristic further supports a social engineering attack vector.

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.ru/pify?keyword=exercise+on+simple+past+tense+with+answers
    • http://files.atruechristian.com/uploads/1/3/1/4/131453982/kakepa.pdf
    • http://files.phimi.pt/uploads/1/3/1/4/131482954/4e834d.pdf
    • http://files.nysaafg.org/uploads/1/3/1/0/131070872/c56ee33e4.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6184/files/penetaluxofejadoxizuxo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0580/4698/files/botulujisiwix.pdf
    • https://cdn.shopify.com/s/files/1/0438/1189/7504/files/mawetorezerewugixopu.pdf
    • https://cdn.shopify.com/s/files/1/0436/8728/0790/files/banking_awareness_questions.pdf
    • https://cdn.shopify.com/s/files/1/0430/7537/1159/files/kurorulawalafikud.pdf
    • https://cdn.shopify.com/s/files/1/0433/0386/2440/files/dutusukup.pdf
    • https://cdn.shopify.com/s/files/1/0427/8052/4710/files/11742967901.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/difference_between_parametric_and_nonparametric_statistical_tests.pdf
    • https://cdn.shopify.com/s/files/1/0429/7526/4924/files/52836358973.pdf
    • https://cdn.shopify.com/s/files/1/0430/2402/3715/files/zavazalivasidajaz.pdf
    • https://cdn.shopify.com/s/files/1/0434/1940/2397/files/jadug.pdf
    • https://cdn.shopify.com/s/files/1/0433/3830/1594/files/69291460766.pdf
    • https://cdn.shopify.com/s/files/1/0437/6104/1559/files/public_infrastructure_asset_management.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d5d.bin
afece606632d5ddf0f57017784009b423e64ab1fc0035be37517fd912a7e9fd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D5D 5080 bytes
font_01_sfnt_off00005e79.bin
e25ca8c520b0f36224c87363976ce0e85ac317c29b40da50e08baf99e4dbd5c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E79 9996 bytes
font_02_sfnt_off000080bc.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x80BC 4324 bytes