Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac9a915cca4147db…

MALICIOUS

PDF

50.1 KB Created: 2020-08-15 16:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e16f64107a54c0903025709e559a23c SHA-1: 2976aeeffac77d81867eac0bc44af3b5999a4629 SHA-256: ac9a915cca4147db52db2b55ea0a6ecd462efa6f661155ca62d32ac4e5a2e4f1
152 Risk Score

Malware Insights

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

The PDF contains a prominent link to 'ttraff.com', identified as a malicious redirector. The document body also contains the text 'Yowhatsapp v8. 1', suggesting a lure for a software update. The PDF also hosts a large number of external links, many pointing to Shopify domains, likely as part of a link farm to improve SEO for malicious content. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=yowhatsapp+v8.+1
    • http://files.thetalenthackers.com/uploads/1/3/0/7/130775565/7998730.pdf
    • http://files.kathleenkeenan.com/uploads/1/3/0/7/130739457/durapa.pdf
    • http://files.moveks.org/uploads/1/3/1/3/131379115/deseroratukaz-kepurud-petiwix-begufi.pdf
    • http://gejene.formphotography.ca/uploads/1/3/1/6/131606349/xonumaxoxexo.pdf
    • http://files.aminakhalifa.com/uploads/1/3/1/4/131482886/sukig_baditepononulil_bolugegipe.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5864/files/ribazibepifobiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/0269/1743/files/38296292472.pdf
    • https://cdn.shopify.com/s/files/1/0430/3332/9817/files/11845836065.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/2443783986.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0901/files/xusatuwevojemifidibe.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/sefutabipevufigivutafom.pdf
    • https://cdn.shopify.com/s/files/1/0432/4956/5853/files/8451448452.pdf
    • https://cdn.shopify.com/s/files/1/0437/7188/7767/files/85802360598.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36920421444.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/toma_de_baciloscopia.pdf
    • https://cdn.shopify.com/s/files/1/0429/8581/6218/files/dean_koontz_prodigal_son.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000656e.bin
8404d5a44c0312a323a0f2f21572e2d853e4dde96046af084aa0183341115cec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x656E 5168 bytes
font_01_sfnt_off00007722.bin
3f2cbacdb13502c7c7862f585a68c0dee4125f8bcb7f603db4824b969ca39ee1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7722 2408 bytes
font_02_sfnt_off00008170.bin
1108ea368bcb72403043cfa20f1ce7969f6c45e785703205af98efaddc7d4085		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8170 10120 bytes
font_03_sfnt_off0000a458.bin
bfac2d67d02e92920ceae0489aadcf30469e9807cdfafb3883245584a7509506		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA458 16664 bytes

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