Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87b5a892c5cbdac…

MALICIOUS

PDF

63.4 KB Created: 2020-08-08 23:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a1efe25f4e63b37e903157f4f053d95 SHA-1: ef08e7ccfffc8cfccfb6dc8a5aad69bad4a6de77 SHA-256: d87b5a892c5cbdacc2592cdd9416452a26d4c670ca85f88721408835f27b0ca7
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a malicious redirector link and a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. The presence of a 'download button' heuristic further supports a lure-based attack. The primary malicious URL identified is https://ttraff.ru/pify?keyword=byomkesh+bakshi+chiriyakhana+pdf, which is flagged as a known malicious redirector.

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=byomkesh+bakshi+chiriyakhana+pdf
    • http://files.aayfitnessandyogabyjamie-dee.com/uploads/1/3/1/6/131637553/acb5c2.pdf
    • http://gosigol.mquinn.online/uploads/1/3/1/4/131453870/20a98a014b.pdf
    • http://files.parsonsarea.org/uploads/1/3/2/3/132303406/xasosefebekus-relivajosur.pdf
    • http://files.pleasuresilb.com/uploads/1/3/0/9/130969944/38a61c410bb.pdf
    • http://tugofe.darkkentphotography.com/uploads/1/3/1/1/131163635/poxositodopozil.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6905/files/85619936121.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rowogumidakedodovejizana.pdf
    • https://cdn.shopify.com/s/files/1/0430/5167/9893/files/mibupimeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/2694/0067/files/skyscale_lost_guide.pdf
    • https://cdn.shopify.com/s/files/1/0451/8101/0071/files/carreteras_federales_de_mexico_en.pdf
    • https://cdn.shopify.com/s/files/1/0432/2931/5229/files/3434179452.pdf
    • https://cdn.shopify.com/s/files/1/0437/5589/6990/files/19334179031.pdf
    • https://cdn.shopify.com/s/files/1/0430/2657/9610/files/jivumiwafesifitetof.pdf
    • https://cdn.shopify.com/s/files/1/0431/3749/9302/files/20643599095.pdf
    • https://cdn.shopify.com/s/files/1/0428/2505/6412/files/angular_2_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0429/7778/8057/files/quantitative_chemical_analysis_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0440/1335/5166/files/72229830177.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9670/files/wowosoluwosunaxevetab.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0422/files/captive_prince_book_1.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/
    • https://cdn.shopify.com/s/files/1/0434/5082/6905/files/856

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab6f.bin
9a10426a29c530d1b16a1161332b392ce866c098e96c14b1d7c0894298d38eea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB6F 5424 bytes
font_01_sfnt_off0000bdb3.bin
6253e0c34c28dfb2e1b139e8eba62ea7e4a17af849aee6b9e5b2e24d9f411ca4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB3 11108 bytes
font_02_sfnt_off0000e204.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE204 4324 bytes

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