Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5755c40e46283e…

MALICIOUS

PDF

44.0 KB Created: 2020-09-16 22:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1ad76262c1df08e48556a2619cf8ccd SHA-1: 436308ca601d12ec866c0d602ca7c04615f6dedb SHA-256: ff5755c40e46283e8c20d44e5427d1e71112a22d96a5a7fc4e571a574bddaba2
152 Risk Score

Malware Insights

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

The PDF document is disguised as 'Environmental science workbook answers' to trick users into clicking a malicious link. The critical heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms that the embedded URL, https://ttraff.me/wix?keyword=environmental+science+workbook+answers, leads to known malicious redirector infrastructure. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many of which point to potentially malicious PDF files, suggesting a link farm for SEO poisoning or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=environmental+science+workbook+answers
    • http://files.charlottelakits.com/uploads/1/3/1/3/131380531/1815661.pdf
    • http://puzege.phisigmapidavis.com/uploads/1/3/1/3/131379730/sujipijelenewurex.pdf
    • http://pupefinax.robynpforrryan.com/uploads/1/3/2/6/132696063/pegekepogon.pdf
    • http://paxile.pattyspetalsgodfrey.com/uploads/1/3/2/8/132814343/vumirodazisoj.pdf
    • http://files.dazzlersdancestudio.com/uploads/1/3/1/3/131379290/e5e722fe45d5b91.pdf
    • https://cdn.shopify.com/s/files/1/0437/1123/4199/files/28767324839.pdf
    • https://cdn.shopify.com/s/files/1/0429/9712/1178/files/27711712850.pdf
    • https://cdn.shopify.com/s/files/1/0457/8734/9148/files/satibagonowowoma.pdf
    • https://cdn.shopify.com/s/files/1/0462/1795/3433/files/asphalt_9_legends_gameplay_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/5229/3541/files/zigomuloregekam.pdf
    • https://cdn.shopify.com/s/files/1/0429/2214/8003/files/dexaxebigiwemikuxewizaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/19317988681.pdf
    • https://cdn.shopify.com/s/files/1/0434/3532/7653/files/gefopix.pdf
    • https://cdn.shopify.com/s/files/1/0434/9191/7989/files/boxing_training_program_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0429/3738/5123/files/32986674383.pdf
    • https://cdn.shopify.com/s/files/1/0440/1748/3934/files/53759629816.pdf
    • https://cdn.shopify.com/s/files/1/0438/3080/4637/files/phonics_books_for_grade_2.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_off000060bd.bin
d70ac3a5b1296e110b7c12f794a69efdde0e86d5823a2578561a3abfcbe18372		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60BD 5048 bytes
font_01_sfnt_off000071d6.bin
a9d94a43215ceb904f6bc2f20e79d82b8aebcccb06d29e7a8435ad5d1cfeff66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71D6 10268 bytes
font_02_sfnt_off000094e3.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94E3 4324 bytes

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